55. K.Yoshinaga, T. Imasaka, and T. Imasaka*, Femtosecond Laser Ionization Mass Spectrometry for Online Analysis of Human Exhaled Breath, Analytical Chemistry, vol. 96, pp.11542-11548 (2024) DOI:10.1021/acs.analchem.4c02214
54. T. Imasaka*, K.Yoshinaga, and T. Imasaka, Machine Learning for Characterizing
Biofuels Based on Femtosecond Laser Ionization Mass Spectrometry, Analytical Chemistry, vol. 96, pp. 10193-10199 (2024) DOI: 10.1021/acs.analchem.4c00478
53. K. Yoshinaga, L. Wen, T. Imasaka, T. Imasaka, Determination of fatty acid methyl esters by two-color two-photon resonance-enhanced femtosecond ionization mass spectrometry, Analytica Chimica Acta, vol. 1296, 342341 (2024)
52. L. Wen, K. Yoshinaga, T. Imasaka, T. Imasaka*, Trace analysis of nitrated polycyclic aromatic hydrocarbons based on two-color femtosecond laser ionization mass spectrometry, Talanta (IF =6.556) 265 124807 (2023)
51. S. L. Madunil, T. Imasaka, T. Imasaka, Determination of Barbiturates by Femtosecond Ionization Mass Spectrometry, Analytical Chemistry, vol. 94, pp. 14691-14698 (2022) Impact Factor 8.008 表紙に掲載
50. K. Yoshinaga, N. V. Hao, T. Imasaka, T. Imasaka, “Miniature Time-of-Flight Mass Analyzer for Use in Combination with a Compact Highly-Repetitive Femtosecond Laser Ionization Source”, Analytica Chimica Acta, vol.1203, 339673 (2022) Impact Factor 6.911.
49. T. Imasaka, T. Imasaka, Femtosecond Ionization Mass Spectrometry for
Chromatographic Detection, Journal of Chromatography A, vol. 1642, 462023 (2021).
48. S. L. Madunil, T. Imasaka, T. Imasaka, Suppression of Fragmentation
in Mass Spectrometry, Analytical Chemistry, vol. 92, pp. 16016-16023 (2020)、Impact Factor 8.008
47. T. D. Phan, A. Li, H. Nakamura, T. Imasaka, T. Imasaka, Single-Photon Ionization Mass Spectrometry Using a Vacuum Ultraviolet Femtosecond Laser, Journal of the American Society for Mass Spectrometry, vol. 31(8), pp. 1730–1737 (2020) 、表紙に掲載
46. Y. Nakano, T. Imasaka, T. Imasaka, Generation of a Nearly-Monocycle Optical Pulse in the Near-Infrared Region and Its Use as an Ionization Source in Mass Spectrometry, Analytical Chemistry,vol. 92, pp. 7130-7138 (2020) 、impact factor 8.008、表紙に掲載
45. Ju Tiantian, K. Yoshinaga, T. Imasaka, H. Nakamura, T. Imasaka, Time-correlated Single Ion Counting Mass Spectrometer with Long and Short Time-of-flight Tubes and an Evaluation of its Performance for Use in Trace Analysis of Allergenic Substances, Analytical Sciences (Special Issue), vol. 36, pp. 539-543, (2020) 10.2116/analsci.19SBP03
44. Resonant and non-resonant femtosecond ionization mass spectrometry
of organochlorine pesticides, S. L. Madunil, T. Imasaka, T. Imasaka, Analyst, 表紙に掲載
(2020) DOI: 10.1039/C9AN01861A, impact factor 5.227
43. Determination of nerve agent metabolites in human urine by femtosecond
laser ionization mass spectrometry using 2-(bromomethyl)naphthalene as
a derivatizing reagent, V. V. Son, H. Nakamura, T. Imasaka, T. Imasaka,
Anal. Chim. Acta,
vol.1069, pp.82-88 (2019) DOI: 10.1016/j.aca.2019.04.012, impact factor
6.911
42.Determination of pesticides by gas chromatography combined with mass
spectrometry using femtosecond lasers emitting at 267, 400, and 800 nm
as the ionization source, X. Yang, T. Imasaka, T. Imasaka, Analytical Chemistry, vol. 90 (7), pp. 4886–4893 (2018)DOI: 10.1021/acs.analchem.8b00537, impact
factor 8.008
41. Optimal Laser Wavelength for Femtosecond Ionization of Polycyclic Aromatic
Hydrocarbons and their Nitrated Compounds in Mass Spectrometry, A. Li,
T. Imasaka, T. Imasaka, Analytical Chemistry, vol. 90, p.2963-2969 (2018) DOI: 10.1021/acs.analchem.8b00125, impact
factor 8.008, 国際共著
40. Use of chemical conversion for determination of nitrated aromatic hydrocarbons
using femtosecond ionization mass spectrometr , T. Fujii, T. Imasaka, T.
Imasaka, Anal. Chim. Acta, vol. 996, p. 48-53 (2017) DOI: 10.1016/j.aca.2017.09.049, impact factor
4.95
39. Suppression of fragmentation in multiphoton ionization mass spectrometry
using a near-infrared femtosecond laser as an ionization source, A. Li,
T. P. Dinh, T. Imasaka, T. Imasaka, Analyst, vol. 142, p. 3942 -3947 (2017)DOI: 10.1039/c7an01172e, impact factor
5.227, 国際共著
38. Determination of Nerve Agent Metabolites by Ultraviolet Femtosecond
Laser Ionization Mass SpectrometryA. Hamachi, T. Imasaka, H. Nakamura,
A. Li, T. Imasaka, Analytical Chemistry, vol. 89(9), pp.5030-5035, (2017) DOI: 10.1021/acs.analchem.7b00386, impact
factor 8.008, 国際共著
37. Determination of Hexachlorocyclohexane by Gas Chromatography Combined
with Femtosecond Laser Ionization Mass SpectrometryX. Yang, T. Imasaka,
A. Li, T. Imasaka, Journal of the American Society for Mass Spectrometry, vol. 27, pp.1999-2005 (2016) DOI:10.1007/s13361-016-1497-7
36. Determination of Fragrance Allergens by Ultraviolet Femtosecond Laser
Ionization Mass Spectrometry S. Shibuta, T. Imasaka, T. Imasaka, Analytical Chemistry, vol. 88, pp.10693-10700 (2016) DOI:10.1021/acs.analchem.6b03229, 2016
impact factor 8.008
35. Determination of Polycyclic Aromatic Hydrocarbons and Their Nitro-,
Amino- Derivatives Absorbed on Particulate Matter 2.5 by Multiphoton Ionization
Mass Spectrometry Using Far-, Deep-, and Near-Ultraviolet Femtosecond Lasers,
Y. Tang, T. Imasaka, S. Yamamoto, T. Imasaka, Chemosphere, vol. 152, pp. 252-258 (2016) DOI:10.1016/j.chemosphere.2016.02.114, impact
factor 8.943
34. A Simple Method for Evaluation of Pulse Width of an Ultraviolet Femtosecond
Laser Used in Two-Photon Ionization Mass SpectrometryT. Imasaka, A. Hamachi,
T. Okuno, T. Imasaka, Applied Sciences-Basel, vol. 6, 136 (2016) DOI:10.3390/app6050136
33. Detection of Polychlorinated Biphenyls in Transformer Oils in Vietnam
by Multiphoton Ionization Mass Spectrometry Using a Far-Ultraviolet Femtosecond
Laser as an Ionization Source, V. T. T. Duong, V. Duong, N. T. H. Lien,
T. Imasaka, Y. Tang, S. Shibuta, A. Hamachi, D. Q. Hoa, T. Imasaka, Talanta, vol. 149, pp. 275-279 (2016) DOI: 10.1016/j.talanta.2015.11.054, impact
factor 6.556, 国際共著
32. Analysis of Parent/Nitrated Polycyclic Aromatic Hydrocarbons in Particulate
Matter 2.5 Based on Femtosecond Ionization Mass Spectrometry, N. Itouyama,
T. Matsui, S. Yamamoto, T. Imasaka, T. Imasaka, Journal of the American Society for Mass Spectrometry (JASMS), vol. 27, pp. 293-300 (2016) DOI: 10.1007/s13361-015-1276-x
31. Multiphoton Ionization Mass Spectrometry of Nitrated Polycyclic Aromatic
Hydrocarbons, Y. Tang, T. Imasaka, S. Yamamoto, T. Imasaka, Talanta, vol. 140, pp. 109-114 (2015) DOI:10.1016/j.talanta.2015.03.027, impact
factor 6.556
30. Autocorrelation and Frequency-Resolved Optical Gating Measurements
Based on the Third Harmonic Generation in a Gaseous Medium, Y. Takao, T.
Imasaka, Y. Kida, T. Imasaka, Applied Sciences, vol. 5, pp. 136-144 (2015) DOI: 10.3390/app5020136
29. Resonant and Nonresonant Multiphoton Ionization Processes in Mass Spectrometry
of Explosives, A. Hamachi, T. Okuno, T. Imasaka, Y. Kida, T. Imasaka, Analytical Chemistry, vol. 87, pp. 3027-3031(2015) DOI: 10.1021/ac504667t. impact factor 8.008
28. A simple Method for the Measurement of the Optical Pulse Width On-Site
the Mass Spectrometer, T. Imasaka, A. Hamachi, T. Okuno, T. Imasaka, CLEO: 2015 OSA Technical Digest (online) (Optical Society of America, 2015),
paper JTu5A.7, DOI: 10.1364/CLEO_AT.2015.JTu5A.7
27. Determination of Triacetone Triperoxide Using Ultraviolet Femtosecond
Multiphoton Ionization Time-of-Flight Mass Spectrometry, R. Ezoe, T. Imasaka,
T. Imasaka, Anal. Chim. Acta, vol. 853, pp.508-513 (2015) DOI: 10.1016/j.aca.2014.10.045, impact factor
6.911
26. An Evaluation of the Spectral Properties for Nerve Agents for Laser
Ionization Mass Spectrometry, T. Imasaka, T. Imasaka, Anal. Sci., vol. 30(12), pp. 1113-1120 (2014) DOI: 10.2116/analsci.30.1113
25. Autocorrelator for Measuring an Ultrashort Optical Pulse Width in the
Ultraviolet Region Based on Two-Photon Ionization of an Organic Compound,
T. Okuno, T. Imasaka, Y. Kida, T. Imasaka, Optics Communications, vol. 310, pp. 48-52 (2014) JDOI: 10.1016/j.optcom.2013.07.055
24. The Search for a Molecule to Measure an Autocorrelation Trace of the
Second/Third Harmonic Emission of a Ti:sapphire Laser Based on Two-Photon
Resonant Excitation and Subsequent One Photon Ionization, T.Imasaka, T.
Okuno, T. Imasaka, Appl. Physics B: Lasers and Optics, vol. 113, no. 4, pp. 543-549 (2013) DOI: 10.1007/s00340-013-5505-3
23. Searching for a Molecule with a Wide Frequency Domain for Non-Resonant
Two-Photon Ionization to Measure the Ultrashort Optical Pulse Width, T.
Imasaka, T. Imasaka, Opt. Commun., vol.285, pp.3514-3518 (2012) DOI: 10.1016/j.optcom.2012.04.015
22. Molecules with a One Octave Frequency Domain for the Measurement of
the 1-fs Optical Pulse Width T. Imasaka, T. Imasaka, Proc. of the 2012
Conference on Lasers and Electro-Optics (CLEO) (2012), Pres. Number: JTh2A.15
21. Multiphoton Ionization/Mass Spectrometry of Polybrominated Diphenyl
EthersO. Shitamichi, T. Imasaka, T. Uchimura, T. Imasaka, Anal. Methods, Vol.3, pp. 2322-2327 (2011) DOI: 10.1039/c1ay05355h
20. Analysis of Pesticides by Gas Chromatography/Multiphoton Ionization/Mass
Spectrometry Using a Femtosecond Laser L. Adan, T. Imasaka, T. Uchimura,
T. Imasaka, 国際共著, Anal. Chim. Acta, vol.701, pp.52-59 (2011) DOI: 10.1016/j.aca.2011.06.003, impact factor
6.911
19. Gas Chromatography/Femtosecond Multiphoton Ionization/Time-of-Flight
Mass Spectrometry of Dioxins, Y. Watanabe-Ezoe, X. Li, T. Imasaka, T. Uchimura,
T. Imasaka, Analytical Chemistry, vol. 82(15), pp.6519-6525 (2010) DOI: 10.1021/ac1009063, impact factor
8.008
18. Enhancement of Molecular Ions in Mass Spectrometry Using an Ultrashort
Optical Pulse in Multiphoton Ionization, T. Shimizu, Y. Watanabe-Ezoe,
S. Yamaguchi, H. Tsukatani, T. Imasaka, S. Zaitsu, T. Uchimura, T. Imasaka,
Analytical Chemistry, vol. 82(9), pp.3441–3444 (2010) DOI: 10.1021/ac1003773, impact factor
8.008
17. The S1<-S0 0-0 Transition Energies of Polychlorinated Dibenzofurans
(PCDFs) Calculated Using CIS(D) and MP2 with Correction for Correlation
Energies, S. Hirokawa, T. Imasaka, T. Imasaka, Journal of Molecular Structure:THEOCHEM, vol.915(1-3), pp.79-85 (2009) DOI: 10.1016/j.theochem.2009.08.021
16. Gas Chromatography/Time-of-Flight Mass Spectrometry of Triacetone Triperoxide
Based on Femtosecond Laser Ionization, S. Yamaguchi, T. Uchimura, T. Imasaka,
T. Imasaka, Rapid Communications in Mass Spectrometry, vol. 23(19), pp.3101–3106 (2009) DOI: 10.1002/rcm.4225
15. Selective Ionization of 2,4-Xylenol in Mass Spectrometry Using a Tunable
Laser and Supersonic Jet Technique, H. Tsukatani, H. Okudaira, T. Uchimura,
T. Imasaka, T. Imasaka, Analytical Sciences, vol. 25(5), pp.599-604 (2009)DOI: 10.2116/analsci.25.599
14. Near-Ultraviolet Femtosecond Laser Ionization of Dioxins in Gas Chromatography/
Time-of-Flight Mass Spectrometry, S. Yamaguchi, F. Kira, Y. Miyoshi, T.
Uchimura, Y. Watanabe-Ezoe, S. Zaitsu, T. Imasaka, T. Imasaka, Analytica Chimica Acta, vol.632(2), pp.229-233 (2009)DOI: 10.1016/j.aca.2008.11.005, impact factor
6.911
13. Data Processing Technique in Gas Chromatography/Time-of-Flight Mass
Spectrometry, T. Imasaka, N. Nakamura, Y. Sakoda, S. Yamaguchi, Y. Watanabe-Ezoe,
T. Uchimura, T. Imasaka, Analyst, vol. 134(4), pp.712-718 (2009) DOI: 10.1039/b815630a impact factor 5.227
12. Gas Chromatography/Multiphoton Ionization/Mass Spectrometry of Pentachlorodibenzofurans
in Soils, Y. Watanabe-EzoeE, N. Nakamura, T. Uchimura, S. Yamaguchi, T.
Imasaka, T. Imasaka, Organohalogen Compounds, vol.70, pp.2396-2399 (2008)
11. Ab initio MO Study on the S1S0 Origin Transition Energies of Polychlorodibenzofurans
(PCDFs), T. Imasaka, S. Hirokawa, T. Imasaka, Journal of Molecular Structure:THEOCHEM, vol.774(1-3), pp.7-12 (2006) DOI: 10.1016/j.theoshem.2006.07.005
10. Conformational Changes and S1S0 Origin Transition Energies: Polychlorinated
Biphenyls (PCBs)S. Hirokawa, T. Imasaka, Y. Oyakawa, M. Oishi, T. Imasaka,
Journal of Molecular Structure:THEOCHEM, vol.772(1-3), pp.31-37 (2006)DOI: 10.1016/j.theochem.2006.06.009
9. Chlorine Substitution Pattern, Molecular Electronic Properties, and
the Nature of Ligand-Receptor Interaction, Quantitative Property-Activity
Relationships of Polychlorinated Dibenzofurans, S. Hirokawa, T. Imasaka,
T. Imasaka,Chemical Research in Toxicology, vol. 18(2), pp.232-238 (2005).DOI: 10.1021/tx049874f
8. Additivity of Electron Correlation Energy and the Ab initio MO Calculation
of (0,0) S1S0 Transition Energies : Polychlorinated Dibenzofuran, T. Imasaka,
S. Hirokawa,Journal of Molecular Structure:THEOCHEM, vol.710(1-3), pp.19-23 (2004) DOI: 10.1016/j.theochem.2004.08.003
7. Ab initio MO Study on the S1S0 Transitions of Polychlorinated Dibenzo-p-Dioxins,
S. Hirokawa, T. Imasaka, Y. Urakami, Journal of Molecular Structure:THEOCHEM, vol.622(3), pp.229-237 (2003) DOI: 10.1016/S0166-1280 (02)00648-6
6. S0 and S1 States of Monochlorophenols: Ab initio CASSCF MO Study, S.
Hirokawa, T. Imasaka, T. Imasaka, The Journal of Physical Chemistry A, vol. 105(40), pp.9252 -9257 (2001) DOI: 10.1021/jp011533c
5. Mean-Field Theory of the Orientational Ordering of Dipolar Guest Molecules
in -Hydroquinone Clathrate of SO2 and D2S, T. Imasaka, S. Hirokawa, Journal of the Physical Society of Japan, vol. 70(9), pp.2603-2612 (2001)DOI: 10.1143/JPSJ.70.2603
4. Effects of a Crystal Field on the Orientational Phase Transition in
a System of Dipoles: A Mean-Field Study of SO2--Hydroquinone Clathrate,
T. Imasaka, S. Hirokawa, Journal of the Physical Society of Japan, vol. 66(5), pp.1364-1370 (1997) DOI: 10.1143/JPSJ.66.1364
3. Quantum Effects on the Orientational Ordering of H2S and D2S Molecules
Enclosed in -Quinol Clathrate, S. Hirokawa, T. Imasaka, T. Matsuo, Journal of the Physical Society of Japan, vol. 63(2), pp. 593-601 (1994) DOI: 10.1143/JPSJ.63.593
2. Effect of a Crystal Field on the Orientational Ordering of H2S Molecules
Enclosed in -Quinol Clathrate, S. Hirokawa, T. Imasaka (Iwasaki), Journal of the Physical Society of Japan, vol. 59(10), pp. 3797-3798 (1990) Oct.DOI: 10.1143/JPSJ.59.3797
1. Orientational Order of Guest H2S Molecules in -Quinol Clathrate, S.
Hirokawa, T. Iwasaki, Journal of the Physical Society of Japan, vol. 57(11), pp. 3843 -3850 (1988) DOI: 10.1143/JPSJ.57.3843 i