Original papers

  1. "Development of a femtosecond time-resolved near-IR multiplex stimulated Raman spectrometer in resonance with transitions in the 900?1550 nm region", Tomohisa Takaya and Koichi Iwata, Analyst 141, 4283-4292 (2016) [Inside front cover article].
  2. "Femtosecond time-resolved near-infrared spectroscopy of oligothiophenes and polythiophene: Energy location and effective conjugation length of their low-lying excited states", Shunnosuke Okino, Tomohisa Takaya, and Koichi Iwata, Chem. Lett. 44, 1059-1061 (2015).
  3. "Rapid Microstructure Characterization of Polymer Thin Films with 2D-Array Multifocus Raman Microspectroscopy", Ashok Zachariah Samuel, Sohshi Yabumoto, Kenichi Kawamura, and Koichi Iwata, Analyst 140, 1847-1851 (2015) [Front cover article].
  4. "Viscosity Heterogeneity Inside Lipid Bilayers of Single-Component Phosphatidylcholine Liposomes Observed with Picosecond Time-Resolved Fluorescence Spectroscopy", Yuki Nojima and Koichi Iwata, J. Phys. Chem. B 118, 8631-8641 (2014).
  5. "Relaxation Mechanism of β-Carotene from S2 (1Bu+) State to S1 (2Ag-) State: Femtosecond Time-Resolved Near-IR Absorption and Stimulated Resonance Raman Studies in 900-1550 nm Region", Tomohisa Takaya and Koichi Iwata, J. Phys. Chem. A 118, 4071-4078 (2014).
  6. "Electron Density Dependent Composition of the Solvation Shell of Phenol Derivatives in Binary Solutions of Water and Ethanol", Sandor Kunsagi-Mate and Koichi Iwata, J. Sol. Chem. 42, 165-171 (2013).
  7. "The Role of the Solvation Shell Decomposition of Alkali Metal Ions in Their Selective Comlexation by Resorcinarene and Its Cavitand", Yin Li, Zsolt Csok, Laszlo Kollar, Koichi Iwata, Erzsebet Szasz, and Sandor Kunsagi-Mate, Supramol. Chem. 24, 374-378 (2012).
  8. "Nanosecond Time-resolved Infrared Spectra and Structure of the Charge-transfer State of 9,9'-Bianthryl in Acetonitrile", Nobuyuki Asami, Sohshi Yabumoto, Shinsuke Shigeto, Tomohisa Takaya, Hiro-o Hamaguchi, and Koichi Iwata, Chem. Lett. 41, 654-656 (2012).
  9. "Local structures in ionic liquids probed and characterized by microscopic thermal diffusion monitored with picosecond time-resolved Raman spectroscopy", Kyousuke Yoshida, Koichi Iwata, Yoshio Nishiyama, Yoshifumi Kimura, and Hiro-o Hamaguchi, J. Chem. Phys. 136, 104504 (2012).
  10. "Two-step photoionization of trans-stilbene in acetonitrile via an ion-pair precursor studied with picosecond time-resolved absorption and Raman spectroscopies", Hiroko Miki, Kyousuke Yoshida, Chieko Kawate, Rintaro Shimada, Tomohisa Takaya, Koichi Iwata, and Hiro-o Hamaguchi, Chem. Phys. Lett. 527, 27-30 (2012).
  11. "Lipid Bilayer Membrane of Egg-PC Liposome Evaluated as Chemical Reaction Field with Picosecond Time-Resolved Fluorescence Spectroscopy", Yuki Nojima and Koichi Iwata, Chem. Asian J. 6, 1817-1824 (2011).
  12. "Two different charge transfer states of photoexcited 9,9’-bianthryl in polar and nonpolar solvents characterized by nanosecond time-resolved near-IR spectroscopy in the 4500 - 10500 cm-1 region", Nobuyuki Asami, Tomohisa Takaya, Soshi Yabumoto, Shinsuke Shigeto, Hiro-o Hamaguchi, and Koichi Iwata, J. Phys. Chem. A 114, 6351-6355 (2010).
  13. "Effect of cluster formation of solvent molecules on the preferential solvatation of anthracene in binary alcoholic solutions", Sándor Kunsági-Máté and Koichi Iwata, Chem. Phys. Lett. 473, 284-287 (2009).
  14. "Femtosecond Time-Resolved Absorption Anisotropy Spectroscopy on 9,9'-Bianthryl: Detection of Partial Intramolecular Charge Transfer in Polar and Nonpolar Solvents", Tomohisa Takaya, Hiro-o Hamaguchi, and Koichi Iwata, J. Chem. Phys. 130, 014501-1-014501-9 (2009).
  15. "Intermolecular interaction between W(CO)6 and alkane molecules probed by ultrafast vibrational energy relaxation: anomalously strong interaction between W(CO)6 and decane", Motohiro Banno, Koichi Iwata, Hiro-o Hamaguchi, J. Phys. Chem. A 113, 1007-1011 (2009).
  16. "Ultrafast bimolecular radical reaction between S1 p-terphenyl and carbon tetrachloride. Mode-specific acceleration of vibrational dephasing in reactant molecule.", Koichi Iwata, J. Raman Spectrosc. 39, 1512-1517 (2008).
  17. "Vibrational Cooling Process of S1 Trans-Stilbene in Ionic Liquids Observed with Picosecond Time-Resolved Raman Spectroscopy", Koichi Iwata, Kyousuke Yoshida, Yuta Takada, and Hiro-o Hamaguchi, Chem. Lett. 36, 504 (2007).
  18. "Picosecond time-resolved fluorescence study on solute-solvent interaction of 2-Aminoquinoline in room-temperature ionic liquids: π-π aromatic complex formation and unusually slow rotational diffusion." Koichi Iwata, Minoru Kakita, and Hiro-o Hamaguchi, J. Phys. Chem. B 111, 4914 (2007).
  19. "Intra- and inter-molecular vibrational energy transfer in tungsten carbonyl complexes W(CO)5(X) (X=CO, CS, CH3CN, and CD3CN)", Motohiro Banno, Koichi Iwata and Hiro-o Hamaguchi, J. Chem. Phys. 126, 204501 (2007).
  20. "Charge Resonance Character in Charge Transfer State of Bianthryls: Effect of Symmetry Breaking on Time-Resolved Near-IR Absorption Spectra", Tomohisa Takaya, Satyen Saha, Hiro-o Hamaguchi, Moloy Sarkar, Anunay Samanta, Koichi Iwata, J. Phys. Chem. A (letter) 110, 4291 (2006).
  21. "Solvent-dependent intra- and intermolecular vibrational energy transfer of W(CO)6 probed with sub-picosecond time-resolved infrared spectroscopy", Motohiro Banno, Shin Sato, Koichi Iwata, and Hiro-o Hamaguchi, Chem. Phys. Lett. 412, 464 (2005).
  22. "Carrier dynamics in TiO2 and Pt/TiO2 powders observed by femtosecond time-resolved near-infrared spectroscopy at spectral region of 0.9 to 1.5 μm with direct absorption method", Koichi Iwata, Tomohisa Takaya, Hiro-o Hamaguchi, Akira Yamakata, Taka-aki Ishibashi, Hiroshi Onishi, and Haruo Kuroda, J. Phys. Chem. B 108, 20233 (2004).
  23. "Femtosecond electron transfer dynamics of 9,9’-bianthryl in acetonitrile as studied by time-resolved near-infrared absorption spectroscopy", Tomohisa Takaya, Hiro-o Hamaguchi, Haruo Kuroda, and Koichi Iwata, Chem. Phys. Lett. 399, 210 (2004).
  24. "Time-resolved infrared and resonance Raman studies of benzil. Vibrational analysis and structures of the excited states", Misao Mizuno, Koichi Iwata, and Hiroaki Takahashi, J. Mol. Struct. 661-662, 3 (2003).
  25. "Effects of pump and probe light field on picosecond time-resolved resonance Raman spectra of S1 trans-stilbene. Disagreement between Stokes- and anti-Stokes scattering frequencies." Koichi Iwata, Bull. Chem. Soc. Jpn. 75, 1075 (2002).
  26. "Analysis of the Solvent- and Temperature-dependent Raman Spectral Changes of S1 Trans-Stilbene and the Mechanism of the Trans to Cis Isomerization: Dynamic Polarization Model of Vibrational Dephasing and the C=C Double-bond Rotation", Koichi Iwata, Ryosuke Ozawa, and Hiro-o Hamaguchi, J. Phys. Chem. A 106, 3614 (2002).
  27. "Picosecond Dynamics of Stepwise Double Proton Transfer Reaction in the Excited State of the 2-aminopyridine/Acetic acid System", Hironori Ishikawa, Koichi Iwata, and Hiro-o Hamaguchi, J. Phys. Chem. A 106, 2305 (2002).
  28. "Photochemical Bimolecular Reaction between Biphenyl and Carbon Tetrachloride: Observed Ultrafast Kinetics and Diffusion-Controlled Reaction Model", Koichi Iwata, Satoshi Takeuchi and Tahei Tahara, Chem. Phys. Lett. 347, 331 (2001).
  29. "Photoinduced Cl Transfer Reaction between Biphenyl and Carbon Tetrachloride Studied by Nanosecond Time-resolved Infrared Spectroscopy and Picosecond Time-resolved Fluorescence Spectroscopy", Koichi Iwata and Hiroaki Takahashi, J. Mol. Struct. 598, 97 (2001).
  30. "Ultrafast Bimolecular Reaction Kinetics between S1 Trans-Stilbene and Carbon Tetrachloride Studied by Sub-picosecond Time-resolved Visible Absorption Spectroscopy", Koichi Iwata and Hiro-o Hamaguchi, Chem. Lett., 456 (2000).
  31. "Solute-Solvent Energy Transfer and Cooling Kinetics of Photoexcited S1 Trans-Stilbene Probed with Picosecond Raman Spectroscopy: Comparison between Chloroform and Chloroform-d Solutions", Koichi Iwata and Hiro-o Hamaguchi, Laser Chem. 19, 367 (1999).
  32. "Photocyclization of N,N-Diphenyl-1-hydroxy-9,10-anthraquinone Diimines via Excited-State Intramolecular Proton Transfer (ESIPT)", K. Kobayashi, M. Iguchi, T. Imakubo, K. Iwata, and H. Hamaguchi, J. Chem. Soc., Perkin Trans. 2 1993 (1998).
  33. "Vibrational Cooling Kinetics of S1 Trans-Stilbene in Sodium Dodecyl Sulfate Micellar Solution Observed with Picosecond Time-Resolved Resonance Raman Spectroscopy", Koichi Iwata and Hiro-o Hamaguchi, J. Raman Spectrosc. 29, 915 (1998).
  34. "ESIPT-Induced Photocyclization of N,N-Diphenyl-1,5- dihydroxyanthraquinone Diimine", Keiji Kobayashi, Mayumi Iguchi, Tatsuro Imakubo, Koichi Iwata and Hiro-o Hamaguchi, J. Chem. Soc. Chem. Comm. 763-764 (1998).
  35. "Mechanism of photochemical reaction between anthracene and carbon tetrachloride studied by time-resolved infrared spectroscopy", Koichi Iwata and Hiro-o Hamaguchi, J. Mol. Struct. 413-414, 101 (1997).
  36. "Photoinduced Picosecond Bimolecular Reaction between Trans-Stilbene and Carbon Tetrachloride", Koichi Iwata and Hiro-o Hamaguchi, Bull. Chem. Soc. Jpn. 70, 2677 (1997).
  37. "Microscopic Mechanism of the Solute-solvent Energy Dissipation Probed by Picosecond Time-resolved Raman Spectroscopy", Koichi Iwata and Hiro-o Hamaguchi, J. Phys. Chem. A 101, 632 (1997).
  38. "Temperature dependent kinetics of picosecond bimolecular reaction between S1 trans-stilbene and carbon tetrachloride: Is ultrafast photochemical reaction diffusion-controlled?", Koichi Iwata and Hiro-o Hamaguchi, Chem. Phys. Lett. 261, 208 (1996).
  39. "The Exchange Polarization Model of Photoisomerization: A Rationale for Profound Solvent Effects on Photoisomerization of Trans-Stilbene and All-Trans Retinal", Volker Deckert, Koichi Iwata and Hiro-o Hamaguchi, J. Photochem. Photobiol. A 102, 35 (1996).
  40. "Vibrational Cooling Process in Solution Probed by Picosecond Time-Resolved Raman Spectroscopy. Analysis of the Cooling Kinetics", Koichi Iwata and Hiro-o Hamaguchi, J. Mol. Liquids 65/66, 417 (1995).
  41. "Time-resolved infrared spectroscopic diagnosis of a bimolecular chemical reaction in room temperature solution: the CCl3 radical produced from S1 trans-stilbene and carbon tetrachloride", Koichi Iwata, Shuichi Kataoka, and Hiro-o Hamaguchi, Chem. Lett. 2131 (1994).
  42. "Picosecond Time-resolved Raman Spectroscopy of S1 p-Terphenyl and p-Terphenyl-d14 in Solution: Time-dependent Changes of Raman Band Shapes", Koichi Iwata and Hiro-o Hamaguchi, J. Raman Spectrosc. 25, 615 (1994).
  43. "Anomalous Lifetime Shortening of S1 Trans-Stilbene in Carbon Tetrachloride as Revealed by Picosecond Time-resolved Raman, Absorption, and Fluorescence Spectroscopies", Koichi Iwata, Bulat Toleutaev, and Hiro-o Hamaguchi, Chem. Lett. 1603 (1993).
  44. "Time dependence of the depolarization ratio in picosecond time-resolved Raman spectroscopy. Effect of reorientation", Koichi Iwata, William L. Weaver, and Terry L. Gustafson, Chem. Phys. Lett. 210, 50 (1993).
  45. "Exchange Model of Vibrational Dephasing in S1 Trans-stilbene in Solution and Its Possible Correlation with Isomerization Reaction", Hiro-o Hamaguchi and Koichi Iwata, Chem. Phys. Lett. 208, 465 (1993).
  46. "Construction of a Transform-limited Picosecond Time-resolved Raman Spectrometer", Koichi Iwata, Shoichi Yamaguchi, and Hiro-o Hamaguchi, Rev. Sci. Instrum. 64(8), 2140-2146 (1993).
  47. "Improvements in the Amplification of Ultrafast Pulses at MHz Repetition Rates: Characterization of a Six Pass Amplifier", William L. Weaver, Koichi Iwata, and Terry L. Gustafson, J. Opt. Soc Am. B. 10, 852 (1993).
  48. "Spontaneous Raman Spectra of the Cyanine Dye DODCI and Its Six Analogues Using Ti:Sapphire Laser Excitation", Koichi Iwata, William L. Weaver, and Terry L. Gustafson, J. Phys. Chem. 96, 10219 (1992).
  49. "Picosecond Structural Relaxation of S1 Trans-Stilbene in Solution as Revealed by Time-resolved Raman Spectroscopy", Koichi Iwata and Hiro-o Hamaguchi, Chem. Phys. Lett. 196, 462-468 (1992).
  50. "Solvent/Solute Interactions Probed by Picosecond Transient Raman Spectroscopy: Mode Specific Vibrational Dynamics in S1 Trans-Stilbene", William L. Weaver, Lisa A. Huston, Koichi Iwata, and Terry L. Gustafson, J. Phys. Chem. 96, 8956 (1992).
  51. "Broadband Picosecond Transient Absorption Spectroscopy at MHz Repetition Rates", L. A. Huston, K. Iwata, W. L. Weaver, and T. L. Gustafson, Opt. Commun. 88, 105 (1992).
  52. "Improvements in the Generation of Quasi-continuous, Tunable Ultraviolet Excitation for Raman Spectroscopy: Applications to Drug/nucleotide Interactions", R. L. Benson, K. Iwata, W. L. Weaver, and T. L. Gustafson, Appl. Spectrosc. 46, 240 (1992).
  53. "Construction of a Versatile Microsecond Time-Resolved Infrared Spectrometer", K. Iwata and H. Hamaguchi, Appl. Spectrosc. 44, 1431 (1990).
  54. "Temperature-dependent Microsecond Decay Dynamics of Photogenerated Charged Solitons in Trans-Polyacetylene", K. Iwata and H. Hamaguchi, Chem. Phys. Lett. 157, 300 (1989).
  55. "Microsecond Time-Resolved Infrared Spectroscopy of a Thin Film of τ-Form Metal-Free Phthalocyanine Fine Particles", Koichi Iwata, Chihiro Kato, and Hiro-o Hamaguchi, Appl. Spectrosc. 43, 16 (1989).
  56. "Sensitivity Calibration of Multichannel Raman Spectrometers Using the Least-squares-fitted Fluorescence Spectrum of Quinine", K. Iwata, H. Hamaguchi, and M. Tasumi, Appl. Spectrosc. 42, 12 (1988).
  57. "Resonance Raman Studies of the Conformation of Carotenoids in Photosynthetic Bacteria", K. Iwata, H. Hayashi, and M. Tasumi, Biochim. Biophys. Acta 810, 269 (1985).

Reviews

  1. "Chemical reaction dynamics in solutions observed with multi-channel near-infrared femtosecond time-resolved spectroscopy" (in Japanese), Tomohisa Takaya and Koichi Iwata, J. Jpn. Soc. IR Sci. & Tech, 22, 50-56 (2012).
  2. "How ionic liquids affect chemical reactions - energy transfer and reaction dynamics" (in Japanese), Koichi Iwata and Yoshifumi Kimura, Gendai Kagaku 474, 23-26 (2010).
  3. "Application of femtosecond time-resolved near-infrared spectroscopy to photochemistry"(in Japanese), Tomohisa Takaya and Koichi Iwata, Kokagaku (Photochemistry) 41, 23-27（2010).
  4. "Raman - ever developing spectroscopy" (in Japanese), Koichi Iwata, Optronics 28, 86-90 (2009).
  5. "Ultimate Raman spectroscopy in time and space" (in Japanese), Rintaro Shimada, Hideaki Kano, Koichi Iwata, and Hiro-o Hamaguchi, Kogaku 36, 498-507 (2007).
  6. "Local structure formation in alkyl-imidazolium based ionic liquids as revealed by linear and non-linear Raman spectroscopy", Koichi Iwata, Hajime Okajima, Satyen Saha and Hiro-o Hamaguchi, Acc. Chem. Res. 40, 1174-1181 (2007).
  7. "Time-resolved Raman spectroscopy" (in Japanese), Yuta Takada, Koichi Iwata, and Hiro-o Hamaguchi, Shokubai 47, 341 (2005).
  8. "Femtosecond time-resolved near-infrared spectroscopy and "Loose Electrons"" (in Japanese). Koichi Iwata, Bunko Kenkyu 54, 153 (2005).
  9. "Current status of femtosecond time-resolved near-infrared spectroscopy. Development of spectrometer and observation of chemical reactions." (in Japanese), Koichi Iwata，KAST Report 15, 18 (2004).
  10. "Physical Chemistry of S1 Trans-Stilbene in Solution as Studied by Time-resolved Raman Spectroscopy", Hiro-o Hamaguchi and Koichi Iwata, Bull. Chem. Soc. Jpn. 75, 883 (2002).
  11. "Fast Time-resolved Mid-infrared Spectroscopy Using Grating Spectrometers", Mamoru Hashimoto, Tetsuro Yuzawa, Chihiro Kato, Koichi Iwata and Hiro-o Hamaguchi, Handbook of Vibrational Spectroscopy, ed by John M. Chalmers and Peter R. Griffiths, 1, 666, John Wiley & Sons, West Sussex (2002).
  12. "Time-resolved spectroscopy and chemical reactions in solutions" (in Japanese), Koichi Iwata, Bussei Kenkyu 73, 23 (1999).
  13. "Solute-sovent interaction probed with "picosecond Raman thermometer"-ultrafast energy transfer and solvation" (in Japanese), Koichi Iwata, Kagaku to Kogyo .50, 131-134 (1997).
  14. "Picosecond time-resolved Raman spectroscopy" (in Japanese), K. Iwata and H. Hamaguchi, Bunko-Kenkyu .44, 61 (1995).
  15. "Time resolved infrared spectroscopy and its application to short-lived molecular species" (in Japanese), Chihiro Kato, Koichi Iwata and Hiro-o Hamaguchi, Bunko-Kenkyu 40, 255 (1991).

Books / Book Chapters

  1. "Raman Spectroscopy" The Spectroscopical Society of Japan, Spectroscopy Series 1, Kodansha (2015)[written in Japanese]
  2. “Time-resolved Raman Spectroscopy”, Hiro-o Hamatuchi and Koichi Iwata, Encyclopedia of Spectroscopy and Spectrometry, 3rd Edition, Elsevier.

Invited lectures at international meetings

  1. "Lipid Bilayer Membranes as Field of Chemical Reactions - Characterization by Picosecond and Femtosecond Time-resolved Spectroscopy", Koichi Iwata, 1st International Symposium of Institute for Catalysis - Global Collaboration in Catalysis Science toward Sustainable Society, Hokkaido University, Sapporo, Japan, October 2015.
  2. "Weak Molecular Interaction in Condensed Phases Examined with Time-resolved Spectroscopies - Raman and Near-Infrared Absorption", Koichi Iwata, 5th Asian Spectroscopy Conference (ASC 5), University of Sydney, Sydney, Australia, October 2015.
  3. "Structure of porous PMMA thin film examined with multifocus Raman Microspectroscopy", Koichi Iwata, Ashok Zachariah Samuel, Sohshi Yabumoto, and Kenichi Kawamura, SciX 2015, Rhode Island Convention Center, Providence, RI, USA, September 2015.
  4. "Thermal Diffusivity of Lipid Bilayer Membranes Estimated with Picosecond Time-resolved Raman Spectroscopy", Yuki Nojima, Tomohisa Takaya, and Koichi Iwata, 3rd Taiwan International Symposium on Raman Spectroscopy (TISRS 2015), Sum-Moon Lake, Nantou, Taiwan, July 2015.
  5. "Characterizing molecular assemblies with time-resolved Raman spectroscopy - lipid bilayer membranes, ionic liquids and loose electrons", Koichi Iwata, 24th International Conference on Raman Spectroscopy (ICORS 2014), Friedrich Schiller University Jena, Jena, Germany, August 2014 [Plenary Lecture].
  6. "Structure of ionic liquids examined with smaller probes", Manping Ye, Setsuka Arii, Takanori Uwabo, Tomohisa Takaya, and Koichi Iwata, 248th National ACS Meeting, Moscone Center West Builiding, San Francisco, CA, USA, August 2014.
  7. "Loose Electrons Examined with Femtosecond Time-Resolved Near-Infrared Spectroscopy - Solvated Electron and TiO2 Single Crystals", Koichi Iwata, 12th Trombay Symposium on Radiation and Photochemistry (TSRP-2014), Bhabha Atomic Research Centre, Mumbai, India, January 2014.
  8. "Basic Processes in Chemical Reactions Examined with Time-resolved Vibrational Spectroscopy", Koichi Iwata, 7th International Conference on Advanced Vibrational Spectroscopy (ICAVS-7), Kobe Convention Center, Kobe, Japan, August 2013 [Plenary Lecture].
  9. "Basic processes of chemical reactions studied with picosecond time-resolved Raman spectroscopy and femtosecond time-resolved near-IR spectroscopy", Koichi Iwata, 1st Taiwan International Symposium on Raman Spectroscopy (TISRS 2013), National Chiao Tung University, Hsinchu, Taiwan, July 2013.
  10. "Interior of Lipid Bilayer Membrane Characterized with Time-resolved Spectroscopic Techniques", Yuki Nojima, Tomohisa Takaya, and Koichi Iwata, SPEC 2012 "Shedding New Light on Disease", Chiang Mai, Thailand, November 2012.
  11. "Characterizing heterogeneous mesostructures with vibrational relaxation kinetics", Koichi Iwata, 23rd International Conference on Raman Spectroscopy (ICORS 2012), Indian Institute of Science, Bangalore, India, August 2012.
  12. "Electron Relaxation in Ionic Liquid and LaInO3:Pr3+ Observed with Picosecond to Femtosecond Time-resolved Spectroscopies", Koichi Iwata, 11th Trombay Symposium on Radiation and Photochemistry (TSRP 2012), Bhabha Atomic Research Centre, Mumbai, India, January 2012.
  13. "Solvation environments in liposome lipid bilayers probed with advanced fluorescence and Raman spectroscopies", Koichi Iwata, Molecular Spectroscopy with Biological Context - Recent Advances, 38th FACSS (Federation of Analytical Chemistry and Spectroscopy Societies), Reno, NV, USA, October 2011.
  14. "Lipid Bilayer Membrane in Egg-PC Liposome Evaluated as Chemical Reaction Field", Koichi Iwata, 14th Asian Chemical Congress (14ACC), Bangkok, Thailand, September 2011.
  15. "New Attempts with Raman Spectroscopy for Examining Macromolecules and Lipid Bilayer Membranes", Koichi Iwata, XXIIth International Conference on Raman Spectroscopy (ICORS2010), MOF, Boston, MA, USA, August, 2010.
  16. "How Electron Relaxes in Micellar Solution, Ionic Liquid, and TiO2 Photocatalyst: Femtosecond Time-resolved Near-infrared Study", Koichi Iwata, Advanced Spectroscopy and Imaging in Molecular Science, National Chiao Tung University, Hsinchu, Taiwan, July, 2010.
  17. "Tracing elementary processes in chemical reaction with time-resolved spectroscopy - TiO2 and micelle", Department Seminar, Department of Chemistry, University of Hong Kong, , Hong Kong, China, June, 2010.
  18. "Fast processes in mesoscopic structures examined with time-resolved spectroscopies", Koichi Iwata, Ohokayama workshop on fundamental photochemical processes in condensed media, Tokyo Institute of Technology, Tokyo, Japan, June, 2010.
  19. "Loose electrons in micellar solution and TiO2 photocatalysts examined with femtosecond time-resolved near-IR spectroscopy", Koichi Iwata, The Second Asian Spectroscopy Conference (ASC09), Hoam Convention Center, Seoul National University, Seoul, Korea, November, 2009.
  20. "Loss of correlation between microscopic solvation environments and macroscopic properties: Partially ordered structure in ionic liquids", 5th International Conference on Advanced Vibrational Spectroscopy (ICAVS-5), I23, Sebel Hotel, Melbourne, Australia, July, 2009.
  21. "Microscopic Solvation Environments and Macroscopic Properties: Loss of Correlation in Ionic Liquid", Koichi Iwata, Science of Ionic Liquids, Satellite Conference for COIL-3, Cairns, Australia, May, 2009.
  22. "Layers of intermolecular interaction specified with picosecond time-resolved Raman spectroscopy", Koichi Iwata, 80 Years of Raman Effect, "Reflection and the Future", Indian Institute of Science, Bangalore, India, session 1, December, 2008.
  23. "Tracing Loose Electrons"- New Physical Chemistry with Femtosecond Time-resolved Near-infrared Spectroscopy", Koichi Iwata, Department Seminar, Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, USA, December, 200.
  24. "Using Ultrafast Time-resolved Near IR Spectroscopy to Probe Photocatalytic Reactions on TiO2", Koichi Iwata, 35th FACSS (Federation of Analytical Chemistry and Spectroscopy Societies), Ultrafast Vibrational Spectroscopy: Chemistry, Material and Biological Science, Reno, NV, USA, September, 2008.
  25. "Ultrafast chemical reaction dynamics in ionic liquids - effect of local structure", Koichi Iwata, International Symposium on Structure and Reaction Dynamics of Ionic Liquids in Kanazawa, Morning Session, Kanazawa, Japan, September, 2008.
  26. "Photoinduced bimolecular radical reaction between p-terphenyl and carbon tetrachloride studied by picosecond time-resolved Raman spectroscopy - mode-selective acceleration of vibrational dephasing", 20th International Conference on Raman Spectroscopy (ICORS2008), London, UK, Session K3, August, 2008.
  27. "Tracing "Loose Electrons"-New Physical Chemistry with Femtosecond Time-resolved Near-infrared Spectroscopy", Seminar, Department of Physics, Northeastern University, Boston, MA, USA, July, 2008.
  28. "Tracing "Loose Electrons"-New Physical Chemistry with Femtosecond Time-resolved Near-infrared Spectroscopy", Seminar, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA , USA, July, 2008.
  29. "Tracing "Loose Electrons"-New Physical Chemistry with Femtosecond Time-resolved Near-infrared Spectroscopy", Department Seminar, Department of Chemistry, Emory University, Atlanta, GA , USA, June, 2008.
  30. "Tracing "Loose Electrons"-New Physical Chemistry with Femtosecond Time-resolved Near-infrared Spectroscopy", Chemistry Department Seminar, Department of Chemistry, Brookhaven National Laboratory, Upton, NY , USA, June, 2008.
  31. "Tracing "Loose Electrons"-New Physical Chemistry with Femtosecond Time-resolved Near-infrared Spectroscopy", Department Seminar, Department of Chemistry, University of Pittsburgh, Pittsburgh, PA , USA, June, 2008.
  32. "Femtosecond time-resolved near-infrared spectroscopy - new tool for tracing ″loose electrons″ in chemical reactions.", Physical Chemistry Seminar, Department of Chemistry, University of Washington, Seattle, WA , USA, April, 2008.
  33. "Examination of Dynamic Processes in Chemical Reaction with Time-Resolved Spectroscopic Techniques", Koichi Iwata, Tokyo International Symposium on Time- and Space-Resolved Vibrational Spectroscopy, Tokyo, January, 2008.
  34. "Photochemical and Photophysical Processes in Room-temperature Ionic Liquids Studied by Ultrafast Time-resolved Spectroscopy", Koichi Iwata, Trombay Symposium on Radiation and Photochemistry (TSRP2008), IT-10, Pune, India, January, 2008.
  35. "Tracing Chemical Reactions with Time-resolved Spectroscopies", Department Seminar, Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu, Taiwan, November, 2007.
  36. "Femtosecond time-resolved near-infrared spectroscopy as a new and ideal method for studying chemical reaction dynamics in condensed phases", Koichi Iwata, Annual Meeting of the Spectroscopic Society of Japan, Symposium 1. Invitation to advanced near infrared spectroscopy, Tokyo, Japan, November, 2007.
  37. "Tracing "Loose Electrons"- New Physical Chemistry with Femtosecond Time-resolved Near-infrared Spectroscopy", Koichi Iwata, Seminar, Institute of Atomic and Molecular Sciences Academia Sinica, Taipei, Taiwan, November, 2007.
  38. "Ultrafast carrier dynamics in TiO2 particles monitored with femtosecond time-resolved near-infrared spectroscopy", Koichi Iwata, The International Conference on Optoelectronics and Spectroscopy of Nano-Structured Thin films and Materials (ICOSFM’ 2007), Beijing, China, October, 2007.
  39. "Tracing ″Loose Electrons″- New Physical Chemistry with Femtosecond Time-resolved Near-infrared Spectroscopy", Koichi Iwata, Department Seminar, Department of Chemistry, The Ohio State University, Columbus, OH, USA, October, 2007.
  40. "Picosecond Time-resolved Raman and Fluorescence Studies of Ionic Liquids: Disagreement between Macroscopic and Microscopic Properties", Koichi Iwata, 2nd International Congress on Ionic Liquids (COIL-2), LTuA6, Yokohama, Japan, August, 2007.
  41. "Chemical reactions in ionic liquids studied by picosecond time-resolved Raman spectroscopy and femtosecond time-resolved near-infrared spectroscopy", Koichi Iwata, Structure and Dynamics of Ionic Liquids, A10, Kazusa, Chiba, Japan, August, 2007.
  42. "Exploring new physical chemistry with femtosecond time-resolved near-infrared spectroscopy", Koichi Iwata, 2007 International Summer School Frontiers on Modern Physical Chemistry, National Chiao Tung University, Hsinchu, Taiwan, July, 2007.
  43. "Tracing chemical reactions in molecular and ionic liquids with picosecond time-resolved Raman spectroscopy and femtosecond time-resolved near-infrared spectroscopy", Koichi Iwata, Department Colloquium, Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ, USA, May, 2007.
  44. "Fast dynamics in ionic liquids probed with time-resolved spectroscopy: Raman, fluorescence, and near-infrared", Koichi Iwata, The First Asian Spectroscopy Conference (ASC '07), TA-19, Bangalore, India, January, 2007.
  45. "Vibrational Dynamics in Ionic Liquids Observed with Picosecond Time-Resolved Raman Spectroscopy", Koichi Iwata, Yuta Takada, Kyousuke Yoshida and Hiro-o Hamaguchi, 20th International Conference on Raman Spectroscopy (ICORS2006), TTuB5, Pacifico Yokohama Conference Center, Yokohama, Japan, August, 2006.
  46. "Dynamic Behavior of "Loose Electrons" Observed with Femtosecond Time-Resolved Near-Infrared Spectroscopy at 900 to 1600 nm", Koichi Iwata, International Workshop on Time-Resolved Spectroscopy (IWTS-2006), VI-2, RIKEN, Wako, Japan, August, 2006.
  47. "Development of femtosecond time-resolved near-infrared spectroscopy and its application to photochemical systems", Koichi Iwata, The third Indo-Japan student symposium, University of Hyderabad, Hyderabad, India, January, 2006.
  48. "Dynamic behavior of loose electrons in bianthryl derivatives and TiO2. Femtosecond time-resolved near-infrared studies", Koichi Iwata, Trombay Symposium on Radiation & Photochemistry (TSRP-2006), IT-18, Mumbai, India, January, 2006.
  49. "Comments on "Control of Photons and Plasmons" (as discussion leader), Koichi Iwata, The University of Tokyo COE21 Program at Department of Physics, "Quantum Extreme Systems and Their Symmetries", International Workshop 2005 "Frontiers of Laser and Optical Sciences", Tokyo, Japan, October, 2005.
  50. "Progress report from a neighbor of infrared - tracing "loose electrons" with femtosecond time-resolved near-infrared spectroscopy", Koichi Iwata, Twelfth International Conference on Time-resolved Vibrational Spectroscopy (TRVS XII), Gaithersburg, USA, FA-04, May, 2005.
  51. "Time-resolved fluorescence spectroscopy", Koichi Iwata, Two-day workshop of spectroscopy and its applications, Coimbatore, India, February, 2005.
  52. "Basic concepts in fluorescence spectroscopy", Koichi Iwata, Two-day workshop of spectroscopy and its applications, Coimbatore, India, February, 2005.
  53. "Application of femtosecond time-resolved near-infrared spectroscopy to photochemical reactions", Koichi Iwata, Discussion Meeting on Advances in Spectroscopy (DMAS 2005), Bangalore, India, February, 2005.
  54. "Fourier Transform and Spectroscopy", Koichi Iwata, Indo-Japan Student Symposium, Bangalore, India, February, 2005.
  55. "Tracing electron motion with femtosecond time-resolved near-infrared spectroscopy", Koichi Iwata, Trombay Symposium on Radiation & Photochemistry (TSRP-2004), Mumbai, India, January, 2004.
  56. "Electron Transfer Processes Studied by Femtosecond Time-Resolved Near-Infrared Spectroscopy", Koichi Iwata, Japan-Korea Joint Seminar on Frontiers of Advanced Molecular Science: Spectroscopy of Ultra-Resolution in Time, Space and Energy，Wako, Japan, November, 2003.
  57. "Tracing intra- and inter-molecular electron transfer reactions with femtosecond time-resolved near-infrared spectroscopy", Koichi Iwata, The 14th SNU-UT-NTU Chemistry Symposium, Seoul, Korea, October, 2003.
  58. "Application of time-resolved spectroscopy to partially ordered systems in condensed phases", Koichi Iwata, Indo/Japan symposium Structure and Dynamics of complex molecular systems: From a molecule to a living cell, Tokyo, Japan, January, 2003.
  59. "Mechanism of Stepwise Double Proton-Transfer Reaction between 2-Aminopyridine and Acetic Acid", Koichi Iwata, Hironori Ishikawa, and Hiro-o Hamaguchi, The IX International Conference on Laser Applications in Life Sciences (LALS 2002), Vilnius, Lithuania, July, 2002.
  60. "Disagreement between Stokes and anti-Stokes scattering Frequencies in Picosecond Time-resolved Raman Spectroscopy", Koichi Iwata, Tenth International Conference on Time-resolved Vibrational Spectroscopy (TRVS2001), Okazaki, Japan, May, 2001.
  61. "Probing Translational Motion of Molecules in Solutions by Sub-picosecond Time-resolved Spectroscopies", Koichi Iwata, Indo-Japan Information Exchange Seminar Meeting on the Theme of Molecular Dynamics, Bangalore, India, January, 2001.
  62. "Successful Application of Diffusion Models to Ultrafast Processes in Solution, Koichi Iwata, "The Structure and Dynamics of Photogenerated Intermediates in Solution: Vibrational and Electronic Studies" (Symposium #147), The 2000 International Chemical Congress of Pacific Basin Societies (PACIFICHEM 2000), Honolulu, Hawaii, USA, December, 2000.
  63. "Is a Picosecond Chemical Reaction Diffusion-Controlled?", Koichi Iwata and Hiro-o Hamaguchi, 11th SNU-UT Chemistry Symposium, Tokyo, Japan, November, 2000.
  64. "Photoinduced Cl Transfer Reactions between Four Aromatic Molecules and Carbon Tetrachloride Studied by Nanosecond Time-resolved Infrared Spectroscopy and Picosecond Time-resolved Fluorescence Spectroscopy", Koichi Iwata, Hiro-o Hamaguchi, and Hiroaki Takahashi, 8th International Conference on Laser Application in Life Sciences (LALS2000), Tokyo, Japan, August, 2000.
  65. "Extension of Diffusion Concepts for Fast Processes in Solution", Koichi Iwata, Gordon Research Conference on Vibrational Spectroscopy and Molecular Dynamics, Newport, RI, USA, August, 2000.
  66. "Ultrafast bimolecular reactions in solution - Observed kinetics and diffusion controlled reaction model", Koichi Iwata, The 63rd Okazaki Conference on "Laser Spectroscopy of Molecular Clusters -Structure and Dynamics-", Okazaki, Japan, March, 1999.
  67. "Vibrational cooling of S1 trans-stilbene in SDS micellar solution observed with picosecond time-resolved Raman spectroscopy", Koichi Iwata, The 7th International Conference on Laser Application in Life Sciences (LALS98), Bratislava, Slovakia, August, 1998.
  68. "Solute-solvent energy transfer and solvation structure studied by picosecond time-resolved Raman spectroscopy", Koichi Iwata, The 7th Japan-Korea Joint Symposium on Molecular Spectroscopy of Clusters and Related Compounds, Okazaki, Japan, January, 1997.
  69. "Instrumentation Symposium", Instrumentation Workshop, Fifteenth International Conference on Raman Spectroscopy (ICORS96), Pittsburgh (USA), August, 1996.
  70. "Excess energy dissipation process from photoexcited solute molecule monitored with picosecond time-resolved Raman spectroscopy", Koichi Iwata and Hiro-o Hamaguchi, The Tokyo Symposium "New Developments in Ultrafast Time-Resolved Vibrational Spectroscopy", Tokyo, Japan, December, 1995.
  71. "Picosecond Time-resolved Raman Observation of the Mode-dependent Vibrational Dynamics in S1 Trans-stilbene", Koichi Iwata and Hiro-o Hamaguchi, 6th International Conference on Time-resolved Vibrational Spectroscopy (TRVS93), Berlin, Germany, June, 1993.