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 ChimicaActa, Accepted
52. L.Wen, K. Yoshinaga, T. Imasaka, and T. Imasaka*, Trace Analysis of Nitrated pPolycyclic Aromatic Hydrocarbons Based on Two-color Femtosecond Laser Ionization Mass Spectrometry, Talanta, 265 (2023) 124807
51. S. L. Madunil, T. Imasaka, T. Imasaka, Determination of Barbiturates by Femtosecond Ionization Mass Spectrometry, Analytical Chemistry, vol. 94, pp. 14691-14698 (2022) Our work is also featured on the front cover !!
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)
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 6.785
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) 、 Our work is also featured on the front
cover !!
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 6.785、 Our work is also featured
on the front cover !!
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), accepted, (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,
(2020) DOI: 10.1039/C9AN01861A, impact factor 4.019
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,Analytica Chimica Acta,
vol.1069, pp.82-88 (2019) DOI: 10.1016/j.aca.2019.04.012, impact factor
5.256
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 6.35
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 6.35, international co-authored paper
40.Use of chemical conversion for determination of nitrated aromatic hydrocarbons
using femtosecond ionization mass spectrometry, T. Fujii, T. Imasaka, T. Imasaka,Analytica Chimica Acta, vol. 996, p. 48-53 (2017) DOI: 10.1016/j.aca.2017.09.049, impact factor
5.256
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
4.019, international co-authored paper
38.Determination of Nerve Agent Metabolites by Ultraviolet Femtosecond Laser
Ionization Mass Spectrometry A, 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 6.35, international co-authored paper
37.Determination of Hexachlorocyclohexane by Gas Chromatography Combined with
Femtosecond Laser Ionization Mass Spectrometry, X. 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, impact factor
3.202
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 6.35
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 5.108
34.A Simple Method for Evaluation of Pulse Width of an Ultraviolet Femtosecond
Laser Used in Two-Photon Ionization Mass Spectrometry,T. Imasaka, A. Hamachi, T. Okuno, T. Imasaka,Applied Sciences-Basel, vol. 6, 136 (2016) DOI:10.3390/app6050136, impact factor 2.217
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 4.916, 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, impact factor
3.202
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 4.916
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, impact factor 2.217
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 6.35
28. Asimple 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,Analytica Chimica Acta, vol. 853, pp.508-513 (2015) DOI: 10.1016/j.aca.2014.10.045, impact factor
5.526
26.An Evaluation of the Spectral Properties for Nerve Agents for Laser Ionization
Mass Spectrometry, T. Imasaka, T. Imasaka,Analytical Science, vol. 30(12), pp. 1113-1120 (2014) DOI: 10.2116/analsci.30.1113, impact
factor 1.618
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 Communication, vol. 310, pp. 48-52 (2014) JDOI: 10.1016/j.optcom.2013.07.055, impact
factor 1.961
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, impact
factor 1.769
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,Optics Communications, vol.285, pp.3514-3518 (2012) DOI: 10.1016/j.optcom.2012.04.015, impact
factor 1.961
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 Ethers, O. Shitamichi, T. Imasaka, T. Uchimura, T. Imasaka,Analytical Methods, Vol.3, pp. 2322-2327 (2011) DOI: 10.1039/c1ay05355h, impact factor 2.378
20.Analysis of Pesticides by Gas Chromatography/Multiphoton Ionization/Mass
Spectrometry Using a Femtosecond Laser, L. Adan, T. Imasaka, T. Uchimura, T. Imasaka,Analytica Chimica Acta, vol.701, pp.52-59 (2011) DOI: 10.1016/j.aca.2011.06.003, impact factor
5.256
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
6.35
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
6.35
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,
impact factor 1.403
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, impact factor
2.045
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, impact factor
1.618
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
5.256
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 4.019
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,
impact factor 1.403
10.Conformational Changes and S1<- S0 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,
impact factor 1.403
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, impact factor 3.278
8.Additivity of Electron Correlation Energy and the Ab initio MO Calculation
of (0,0) S1 <- S0 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,
impact factor 1.403
7.Ab initio MO Study on the S1 <- S0 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,
impact factor 1.403
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, impact factor
2.847
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, impact factor
1.485
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, impact factor
1.485
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, impact factor
1.485
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 impact
factor 1.485
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 impact factor
1.485