大下 慶次郎 (Keijiro OHSHIMO)

東北大学大学院 理学研究科 化学専攻 理論化学研究室 助教

 

経歴

19933     東京都 私立 学習院高等科 卒業

19973     東北大学理学部化学科 卒業

19993     東北大学大学院理学研究科化学専攻 博士前期課程修了

19994     日本学術振興会特別研究員(DC1)(受入機関・東北大学)

20023     東北大学大学院理学研究科化学専攻 博士後期課程修了、博士(理学)

20024     日本学術振興会特別研究員(PD)(受入機関・分子科学研究所)

20037     独立行政法人理化学研究所 鈴木化学反応研究室 研究員

20114     独立行政法人理化学研究所 東原子分子物理研究室 研究員

20124     東京大学大学院理学系研究科化学専攻 化学反応学研究室 客員研究員(兼務)

20134     東北大学大学院理学研究科化学専攻 理論化学研究室 助教(現職)

20154     東北大学 高度教養教育・学生支援機構 助教(〜20173月)

 

論文

72. Keijiro Ohshimo, Xi He, Ryosuke Ito, Kengo Tsunoda, Sota Tainaka, and Fuminori Misaizu

"Cryogenic ion mobility-mass spectrometry for the study of conformations of host-guest complexes"

EPJ Techniques and Instrumentation, accepted.

 

71. Yuto Nakajima, M. Abdul Latif, Toshiaki Nagata, Keijiro Ohshimo, and Fuminori Misaizu

"Size-Dependent Geometrical Structures of Platinum Oxide Cluster Cations Studied by Ion Mobility-Mass Spectrometry"

J. Phys. Chem. A, accepted.

 

70. Yuri Ito, Mizuhiro Kominato, Yuji Nakashima, Keijiro Ohshimo, and Fuminori Misaizu
"Fragment imaging in infrared photodissociation of Ar-tagged protonated water clusters, H3O+-Ar and H+(H2O)2-Ar"
Phys. Chem. Chem. Phys.25, 9404-9412 (2023).

 

69. Satoru Muramatsu, Keijiro Ohshimo, Yuan Shi, Motoki Kida, Rong Shang, Yohsuke Yamamoto, Fuminori Misaizu, Yoshiya Inokuchi

"Gas-Phase Characterization of Hypervalent Carbon Compounds Bearing 7-6-7-Ring Skeleton: Penta-versusTetra-Coordinate Isomers"

Chemistry A European Journal, e202203163 (2023).

 

68. Mitsuo Takayama, Masaaki Ubukata, Keijiro Ohshimo, Kenji Nagatomo, Fuminori Misaizu

"Identification of complementary McLafferty rearrangement ions at m/z 222 and 224 of methylstearate using high-resolution electron ionization time-of-flight mass spectrometer"

Int. J. Mass Spectrom., 484, 116978 (2023). (10 pages)

 

67. Ryosuke Ito, Xi He, Keijiro Ohshimo, Fuminori Misaizu

"Large Conformational Change in the Isomerization of Flexible Crown Ether Observed at Low Temperature"

J. Phys. Chem. A, 126(27), 4359-4366 (2022).

 

66. Masaomi Sanekata, Yuki Nakagomi, Mutsuki Hirayama, Hiroshi Nishida, Nobuo Nishimiya, Masahide Tona, Hiroaki Yamamoto, Keizo Tsukamoto, Kiyokazu Fuke, Keijiro Ohshimo, Kiichirou Koyasu, and Fuminori Misaizu

"Time-of-flight mass spectrometry diagnostics in deep oscillation magnetron sputtering (DOMS) of titanium"

J. Appl. Phys., 131, 243301 (2022). (7 pages)

 

65. Yotaro Misao, Toshiaki Nagata, Motoyoshi Nakano, Keijiro Ohshimo, and Fuminori Misaizu

"Structural assignments of yttrium oxide cluster cations studied by ion mobility mass spectrometry"

Phys. Chem. Chem. Phys., 24, 11096-11103 (2022).

 

64. Ryosuke Ito, Keijiro Ohshimo, and Fuminori Misaizu

"Structures of dibenzo-24-crown-8 complex with an NH4+ ion studied by cryogenic ion mobility-mass spectrometry"

Chem. Phys. Lett., 794, 139510 (2022). (5 pages)

 

63. Toshiaki Nagata, Jenna W. J. Wu, Motoyoshi Nakano, Keijiro Ohshimo, and Fuminori Misaizu

"Geometrical Structures of Gas Phase Cerium Oxide Cluster Cations after Reaction with Nitric Oxide Studied by Ion Mobility Mass Spectrometry"

J. Phys. Chem. A, 126(7), 1204-1210 (2022).

 

62. Masaomi Sanekata, Hiroshi Nishida, Yuki Nakagomi, Yoshihiro Hirai, Nobuo Nishimiya, Masahide Tona, Naoyuki Hirata, Hiroaki Yamamoto, Keizo Tsukamoto, Keijiro Ohshimo, Fuminori Misaizu, and Kiyokazu Fuke

"Dependence of Optical Emission Spectra on Argon Gas Pressure during Modulated Pulsed Power Magnetron Sputtering (MPPMS)"

Plasma, 4(2), 269-280 (2021).

 

61. Keijiro Ohshimo, Xi He, Ryosuke Ito, and Fuminori Misaizu

"Conformer Separation of Dibenzo-Crown-Ether Complexes with Na+ and K+ ions Studied by Cryogenic Ion Mobility-Mass Spectrometry"

J. Phys. Chem. A, 125(17), 3718-3725 (2021).

 

60. Masaomi Sanekata, Hiroshi Nishida, Tatsuya Watabe, Yuki Nakagomi, Yoshihiro Hirai, Nobuo Nishimiya, Masahide Tona, Hiroaki Yamamoto, Naoyuki Hirata, Keizo Tsukamoto, Keijiro Ohshimo, Fuminori Misaizu, and Kiyokazu Fuke

"Delayed discharge bridging two sputtering modes from modulated pulsed power magnetron sputtering (MPPMS) to deep oscillation magnetron sputtering (DOMS)"

Plasma4(2), 239-251 (2021).

 

59. Yuji Nakashima, Yuri Ito, Mizuhiro Kominato, Keijiro Ohshimo, and Fuminori Misaizu

Photofragment ion imaging in vibrational predissociation of the H2O+Ar complex ion

J. Chem. Phys., 154, 174301 (2021).

 

58. Sota Tainaka, Tomoyuki Ujihira, Mayuko Kubo, Motoki Kida, Daisuke Shimoyama, Satoru Muramatsu, Manabu Abe, Takeharu Haino, Takayuki Ebata, Fuminori Misaizu, Keijiro Ohshimo, and Yoshiya Inokuchi

"Conformation of K+(Crown Ether) Complexes Revealed by Ion Mobility-Mass Spectrometry and Ultraviolet Spectroscopy"

J. Phys. Chem. A, 124(48), 9980-9990 (2020).

 

57. Keijiro Ohshimo, Ryosuke Sato, and Fuminori Misaizu

"Intramolecular Dispersion Attraction in Tetraalkylammonium Cations Revealed by Cryogenic Ion Mobility Mass Spectrometry"

J. Phys. Chem. A, 124(39), 7999-8004 (2020).

 

56. Kiichirou Koyasu, Ryohei Tomihara, Toshiaki Nagata, Jenna W. J. Wu, Motoyoshi Nakano, Keijiro Ohshimo, Fuminori Misaizu, and Tatsuya Tsukuda

"Sequential growth of iridium cluster anions based on simple cubic packing"

Phys. Chem. Chem. Phys., 22(32), 17842-17846 (2020).

 

55. M. Abdul Latif, Toshiaki Nagata, Motoyoshi Nakano, Keijiro Ohshimo, and Fuminori Misaizu

"Structure Assignment and Separation of Isomers of Palladium Oxide Cluster Anions Studied by Ion Mobility Mass Spectrometry"

J. Phys. Chem. C, 124(17), 9604-9610 (2020).

 

54. Keijiro Ohshimo, Shun Miyazaki, Keigo Hattori, and Fuminori Misaizu
"Long-distance proton transfer induced by a single ammonia molecule: ion mobility mass spectrometry of protonated benzocaine reacted with NH3"
Phys. Chem. Chem. Phys., 22(15), 8164-8170 (2020).

 

53. Keizo Tsukamoto, Tetsuro Tamura, Hiromi Matsusaki, Masahide Tona, Hiroaki Yamamoto, Yuki Nakagomi, Hiroshi Nishida, Yoshihiro Hirai, Nobuo Nishimiya, Masaomi Sanekata, Keijiro Ohshimo, Kiichirou Koyasu, and Fuminori Misaizu
"Time-of-flight mass spectrometric diagnostics for ionized and neutral species in high power pulsed magnetron sputtering of titanium"
Jpn. J. Appl. Phys., 59, SHHB05 (2020).

 

52. Motoyoshi Nakano, Daiki Hebiguchi, Shohei Azuma, Ryoichi Moriyama, Keijiro Ohshimo, and Fuminori Misaizu
"Structures of Magnesium Oxide Cluster Cations Studied Using Ion Mobility Mass Spectrometry"
J. Phys. Chem. A124(1), 101-107 (2020).

 

51. Yuri Ito, Yuji Nakashima, Kenichi Okutsu, Motoyoshi Nakano, Keijiro Ohshimo, and Fuminori Misaizu

"Visible photodissociation study of NO dimer cation using ion imaging technique combined with theoretical calculations"

Chem. Phys. Lett., 739, 137022 (2020).

 

50. M. Abdul Latif, Jenna W. J. Wu, Toshiaki Nagata, Motoyoshi Nakano, Keijiro Ohshimo, and Fuminori Misaizu

"Compositions and Isomer Separation of Palladium Oxide Cluster Cations Studied by Ion Mobility Mass Spectrometry"

J. Phys. Chem. C, 123(28), 17580-17587 (2019).

 

49. Toshiaki Nagata, Jenna W. J. Wu, Motoyoshi Nakano, Keijiro Ohshimo, and Fuminori Misaizu

"Geometrical Structures of Gas Phase Cerium Oxide Cluster Cations Studied by Ion Mobility Mass Spectrometry"

J. Phys. Chem. C, 123(27), 16641-16650 (2019).

 

48. Fuminori Misaizu, M. Abdul Latif, Jenna W. J. Wu, Ryoichi Moriyama, Motoyoshi Nakano, Kiichirou Koyasu, and Keijiro Ohshimo

"Structures of Stable Oxide Cluster Ions of First-Row Late Transition Metals: An Ion Mobility-Mass Spectrometric Study"

AIP Conf. Proc., 2186, 030017 (2019).

 

47. Ryohei Tomihara, Kiichirou Koyasu, Toshiaki Nagata, Jenna W. J. Wu, Motoyoshi Nakano, Keijiro Ohshimo, Fuminori Misaizu, and Tatsuya Tsukuda

"Structural Evolution of Iridium Oxide Cluster Anions IrnOm- (n = 5-8) with Sequential Oxidation: Binding Mode of O Atoms and Ir Framework"

J. Phys. Chem. C, 123(24), 15301-15306 (2019).

 

46. Keijiro Ohshimo, Tohru Takahashi, Motoyoshi Nakano, Fuminori Misaizu

"Geometrical structures and molecular adsorption reactions of alkali-halide cluster ions investigated by ion mobility-mass spectrometry"

Bull. Soc. Sea Water Sci. Jpn., 73, 59-64 (2019). (Proceeding of World Salt Symposium 2018)

 

45. Yuji Nakashima, Kenichi Okutsu, Keita Fujimoto, Yuri Ito, Manabu Kanno, Motoyoshi Nakano, Keijiro Ohshimo, Hirohiko Kono and Fuminori Misaizu

"Visible photodissociation of the CO2 dimer cation: fast and slow dissociation dynamics in the excited state"

Phys. Chem. Chem. Phys., 21, 3083-3091 (2019).

 

44. M. Abdul Latif, Jenna W. J. Wu, Ryoichi Moriyama, Motoyoshi Nakano, Keijiro Ohshimo, Fuminori Misaizu

"Stable compositions and structures of copper oxide cluster cations CunOm+ (n = 2-8) studied by ion mobility mass spectrometry"

ACS Omega, 3 (12), 18705-18713 (2018).

 

43. Kenichi Okutsu, Kenichiro Yamazaki, Motoyoshi Nakano, Keijiro Ohshimo, Fuminori Misaizu

Ion Imaging of MgI+ Photofragment in Ultraviolet Photodissociation of Mass-Selected Mg+ICH3 Complex

J. Phys. Chem. A, 122 (22), 4948-4953 (2018).

 

42. Keijiro Ohshimo, Kengo Akimoto, Masato Ogawa, Wataru Iwasaki, Hiroaki Yamamoto, Masahide Tona, Keizo Tsukamoto, Motoyoshi Nakano, and Fuminori Misaizu

Correlation between Electronic Shell Structure and Inertness of Cun+ toward O2 Adsorption at n = 15, 21, 41, and 49

J. Phys. Chem. A, 122 (11), 2927-2932 (2018).

 

41. Ryoichi Moriyama, Jenna W. J. Wu, Motoyoshi Nakano, Keijiro Ohshimo, and Fuminori Misaizu

"Small Carbon Nano-Onions: An Ion Mobility Mass Spectrometric Study"

J. Phys. Chem. C, 122 (9), 5195-5200 (2018).

 

40. Jenna W. J. Wu, Ryoichi Moriyama, Motoyoshi Nakano, Keijiro Ohshimo, and Fuminori Misaizu

Compositions and structures of niobium oxide cluster ions, NbmOn±, (m = 212) revealed with ion mobility mass spectrometry

Phys. Chem. Chem. Phys., 19, 24903-24914 (2017).

 

39. Keisuke Hirata, Keishiro Yamashita, Satoru Muramatsu, Shinjiro Takano, Keijiro Ohshimo, Toshiyuki Azuma, Ryuzo Nakanishi, Takashi Nagata, Seiji Yamazoe, Kiichirou Koyasu, and Tatsuya Tsukuda

Anion Photoelectron Spectroscopy of Free [Au25(SC12H25)18]

Nanoscale, 9, 13409-13412 (2017).

 

38. Ryoichi Moriyama, Ryuki Sato, Motoyoshi Nakano, Keijiro Ohshimo, and Fuminori Misaizu

Geometrical Structures of Gas Phase Chromium Oxide Cluster Anions Studied by Ion Mobility Mass Spectrometry

J. Phys. Chem. A 121 (30), 5605-5613 (2017).

 

37. Keijiro Ohshimo, Isamu Mizuuchi, Kengo Akimoto, Keizo Tsukamoto, Masahide Tona, Hiroaki Yamamoto, Motoyoshi Nakano, and Fuminori Misaizu

Mass Spectrometric Study of N2-Adsorption on Copper Cluster Cations Formed by Modulated Pulsed Power Magnetron Sputtering in Aggregation Cell

Chem. Phys. Lett. 682, 60-63 (2017).

 

36. Kenichi Okutsu, Yuji Nakashima, Kenichiro Yamazaki, Keita Fujimoto, Motoyoshi Nakano, Keijiro Ohshimo, and Fuminori Misaizu

"Development of a linear-type double reflectron for focused imaging of photofragment ions from mass-selected complex ions"

Rev. Sci. Instrum. 88, 053105 (2017). (8 pages)

 

35. Kenichi Okutsu, Kenichiro Yamazaki, Keijiro Ohshimo, Fuminori Misaizu

Photofragment ion imaging from mass-selected Mg+BrCH3 complex: Dissociation mechanism following photoinduced charge transfer

J. Chem. Phys. 146 (2), 024301 (2017). (6 pages)

 

34. Ryoichi Moriyama, Jenna W. J. Wu, Keijiro Ohshimo, Fuminori Misaizu

Structures of Vanadium Oxide Cluster Ions up to Nanometer Diameter Investigated by Ion Mobility Mass Spectrometry

Bull. Chem. Soc. Jpn. 89, 1225-1229 (2016).

 

33. Jenna W. J. Wu, Ryoichi Moriyama, Hiroshi Tahara, Keijiro Ohshimo, Fuminori Misaizu

Compositions and Structures of Vanadium Oxide Cluster Ions VmOn+/- (m = 2 20) Investigated by Ion Mobility Mass Spectrometry

J. Phys. Chem. A 120(21), 3788-3796 (2016).

 

32. Keijiro Ohshimo, Naoya Norimasa, Ryoichi Moriyama, Fuminori Misaizu

Stable compositions and geometrical structures of titanium oxide cluster cations and anions studied by ion mobility mass spectrometry

J. Chem. Phys. 144(19), 194305 (2016). (8 pages)

 

31. Hiroshi Hoshino, Yoshihiro Yamakita, Kenichi Okutsu, Yoshitomo Suzuki, Masataka Saito, Kiichirou Koyasu, Keijiro Ohshimo, Fuminori Misaizu

Photofragment imaging from mass-selected ions using a reflectron mass spectrometer I. Development of an apparatus and application to Mg+-Ar complex

Chem. Phys. Lett. 630, 111-115 (2015).

 

30. Kenichi Okutsu, Keijiro Ohshimo, Hiroshi Hoshino, Kiichirou Koyasu, Fuminori Misaizu

Photofragment imaging from mass-selected ions using a reflectron mass spectrometer II. Formation mechanism of MgF+ in the photodissociation of Mg+-FCH3 complex

Chem. Phys. Lett. 630, 57-61 (2015).

 

29. Keijiro Ohshimo, Shohei Azuma, Tatsuya Komukai, Ryoichi Moriyama, Fuminori Misaizu

Structures and CO-Adsorption Reactivities of Nickel Oxide Cluster Cations Studied by Ion Mobility Mass Spectrometry

J. Phys. Chem. C, 119(20), 11014-11021 (2015).

 

28. Keijiro Ohshimo, Tatsuya Komukai, Tohru Takahashi, Naoya Norimasa, J. W. J. Wu, Ryoichi Moriyama, Kiichirou Koyasu, Fuminori Misaizu

Application of Ion Mobility-Mass Spectrometry to the Study of Ionic Clusters - Investigation of Cluster Ions with Stable Sizes and Compositions

Mass Spectrometry 3(3), S0043 (2014). (7 pages)

 

27. Keijiro Ohshimo, Tohru Takahashi, Ryoichi Moriyama, Fuminori Misaizu

Compact Non-Rock-Salt Structures in Sodium Fluoride Cluster Ions at Specific Sizes Revealed by Ion Mobility Mass Spectrometry

J. Phys. Chem. A 118(43), 9970-9975 (2014).

 

26. Keijiro Ohshimo, Tatsuya Komukai, Ryoichi Moriyama, Fuminori Misaizu

"Isomer Separation of Iron Oxide Cluster Cations by Ion Mobility Mass Spectrometry"
J. Phys. Chem. A 118(22), 3899-3905 (2014).

 

25. Kiyoshi Nishizawa, Keijiro Ohshimo, and Toshinori Suzuki

Vacuum ultraviolet and soft X-ray photoelectron spectroscopy of liquid beams using a hemispherical photoelectron spectrometer with a multistage differential pumping system"

J. Chinese Chem. Soc. 60, 1403-1410 (2013).

 

24. Kosuke Ota, Kiichirou Koyasu, Keijiro Ohshimo, and Fuminori Misaizu

"Structures of Cobalt Oxide Cluster Cations Studied by Ion Mobility Mass Spectrometry"

Chem. Phys. Lett. 588, 63-67 (2013).

 

23. Keijiro Ohshimo, Yoshiya Inokuchi, Takayuki Ebata, Koichi Ohno

Anionic Polymerization Mechanism of Acrylonitrile Trimer Anions: Key Branching Point between Cyclization and Chain Propagation

J. Phys. Chem. A 116 (30), 7937-7942 (2012).

 

22. Yoshihiro Ogi, Hiroshi Kohguchi, Dongmei Niu, Keijiro Ohshimo, Toshinori Suzuki

Super-Resolution Photoelectron Imaging with Real-Time Subpixelation by Field Programmable Gate Array and Its Application to NO and Benzene Photoionization

J. Phys. Chem. A 113 (52), 14536-14544 (2009).

 

21. Mizuki Oku, Yu Hou, Xi Xing, Beth Reed, Hong Xu, Chao Chang, Cheuk-Yiu Ng, Kiyoshi Nishizawa, Keijiro Ohshimo, Toshinori Suzuki

3s Rydberg and cationic states of pyrazine studied by photoelectron spectroscopy

J. Phys. Chem. A 112 (11), 2293-2310 (2008).

 

20. Kazuo Watanabe, Anton Kokalj, Yoshiya Inokuchi, Izabela Rzeznicka, Keijiro Ohshimo, Nobuyuki Nishi, Tatsuo Matsushima

Orientation of nitrous oxide on palladium(110) by STM

Chem. Phys. Lett. 406 (4-6), 474-478 (2005).

 

19. Hironori Tsunoyama, Yuichiro Yasumura, Keijiro Ohshimo, Fuminori Misaizu, Koichi Ohno

Electron Distribution and Intracluster Reaction in [Nan(CS2)2]- Negative Ion Clusters

European Phys. J. D 34 (1-3), 89-92 (2005).

 

18. Yoshiya Inokuchi, Keijiro Ohshimo, Fuminori Misaizu, Nobuyuki Nishi

Infrared Photodissociation Spectroscopy of [Mg(H2O)1-4]+ and [Mg(H2O)1-4Ar]+

J. Phys. Chem. A 108 (23), 5034-5040 (2004).

 

17. Yoshiya Inokuchi, Keijiro Ohshimo, Fuminori Misaizu, Nobuyuki Nishi

Structures of [Mg(H2O)1,2]+ and [Al(H2O)1,2]+ ions studied by infrared photodissociation spectroscopy.  Evidence of [HOAlH]+ ion core structure in [Al(H2O)2]+

Chem. Phys. Lett. 390 (1-3), 140-144 (2004).

 

16. Fuminori Misaizu, Hironori Tsunoyama, Yuichiro Yasumura, Keijiro Ohshimo, Koichi Ohno

Photoelectron spectroscopy and density functional theory calculation of Nan(CS2)- cluster negative ions for n=1 and 2

Chem. Phys. Lett. 389 (4-6), 241-246 (2004).

 

15. Hironori Tsunoyama, Keijiro Ohshimo, Fuminori Misaizu, Koichi Ohno

"Intracluster cyclization reaction producing a benzene derivative: Photoionization mass spectrometric study of alkali metal-methyl propiolate clusters"

Int. J. Mass Spectrom. 232, 41-50 (2004).

 

14. Keijiro Ohshimo, Fuminori Misaizu, Koichi Ohno

"Negative-ion photoelectron spectroscopy of acrylonitrile clusters containing a sodium atom"

European Phys. J. D 24(1-3), 339-342 (2003).

 

13. Yoshiya Inokuchi, Keijiro Ohshimo, Kazuhiko Ohashi, Yoshiki Honkawa, Hiroshi Sekiya, Nobuyuki Nishi

Fermi resonance interaction in hetero-dimer and trimer ions containing aniline+

Chem. Phys. Lett. 373(5-6), 568-574 (2003).

 

12. Ari Furuya, Keijiro Ohshimo, Hironori Tsunoyama, Fuminori Misaizu, Koichi Ohno, Hidekazu Watanabe

"Photodissociation of Mg(CH2=CHCN)n+: Excited electronic states of n=1 and 2 and intracluster electron transfer for n=3 and 4"

J. Chem. Phys. 118(12), 5456-5464 (2003).

 

11. Keijiro Ohshimo, Fuminori Misaizu, Koichi Ohno

"Intracluster multiple trimeric cyclization of acrylonitrile clusters initiated by electron transfer from a potassium atom: Size-dependent pathways in metastable dissociation of K+(CH2=CHCN)n photoions"

J. Chem. Phys. 117(11), 5209-5220 (2002).

 

10. Keijiro Ohshimo, Ari Furuya, Hironori Tsunoyama, Fuminori Misaizu, Koichi Ohno

"Photoionization mass spectroscopy of clusters of alkali metal atoms with methyl vinyl ketone and acrolein: Intracluster oligomerization initiated by electron transfer from a metal atom"

Int. J. Mass Spectrom. 216(1), 29-40 (2002).

 

9. Hironori Tsunoyama, Keijiro Ohshimo, Fuminori Misaizu, Koichi Ohno

"Intracluster electron transfer and reactions in alkali metal-methacrylate clusters"

J. Phys. Chem. A 105(42), 9649-9658 (2001).

 

8. Keijiro Ohshimo, Hironori Tsunoyama, Fuminori Misaizu, Koichi Ohno

"Intracluster electron transfer from a metal atom/cluster followed by anionic oligomerization of vinyl molecules"

European Phys. J. D 16(1-3), 107-110 (2001).

 

7. Fuminori Misaizu, Keijiro Ohshimo, Hironori Tsunoyama, Ari Furuya, Koichi Ohno

"Size-Dependent Intracluster Reactions in Metal-Vinyl Molecule Clusters: Anionic Oligomerization Initiated by Electron Transfer"

Trans. MRS-J 26(4), 1135-1138 (2001).

 

6. Hironori Tsunoyama, Keijiro Ohshimo, Fuminori Misaizu, Koichi Ohno

"Intracluster anionic oligomerization of acrylic ester molecules initiated by electron transfer from an alkali metal atom"

J. Am. Chem. Soc. 123(4), 683-690 (2001).

 

5. Keijiro Ohshimo, Fuminori Misaizu, Koichi Ohno

"Anionic oligomerization of acrylonitrile molecules initiated by intracluster electron transfer from alkali metal atoms: Photoionization mass spectrometry of M(CH2=CHCN)n (M=Li, Na and K)"

J. Phys. Chem. A 104(4), 765-770 (2000).

 

4. Hironori Tsunoyama, Keijiro Ohshimo, Yoshihiro Yamakita, Fuminori Misaizu, Koichi Ohno

"Photoionization and density functional theory study of clusters of acetone containing an alkali metal atom, M((CH3)2CO)n (M=Li, Na): Intracluster electron transfer from metal to acetone in 1:1 complexes"

Chem. Phys. Lett. 316(5-6), 442-448 (2000).

 

3. Naoki Kishimoto, Keijiro Ohshimo, Koichi Ohno

"Penning Ionization of Vinyl Chloride and Vinyl Iodide by Collision with He*(23S) Metastable Atoms"

J. Electron Spectrosc. Relat. Phenom. 104(1-3), 145-154 (1999).

 

2. Keijiro Ohshimo, Hironori Tsunoyama, Yoshihiro Yamakita, Fuminori Misaizu, Koichi Ohno

"Photoionization and density functional study of clusters of alkali metal atoms solvated with acetonitrile molecules M(CH3CN)n (M=Li and Na)"

Chem. Phys. Lett. 301(3-4), 356-364 (1999).

 

1. Hideo Yamakado, Kohji Okamura, Keijiro Ohshimo, Naoki Kishimoto, Koichi Ohno

"Effect of HOMO Levels on Chemiionization of Substituted Ethylenes by Metastable Helium Atoms"

Chem. Lett. 269-270 (1997).

 

総説

4. 大下 慶次郎、宮ア 舜、佐藤 良亮、服部 圭吾、美齊津 文典

「プロトン付加分子のイオン移動度質量分析−イオン分子反応による分子内プロトン移動−」

J. Mass Spectrom. Soc. Jpn., 70(1), 36-42 (2022).

 

3. 大下 慶次郎、美齊津 文典

「イオン移動度質量分析によるクラスターイオンの構造異性体分離」

分光研究、分光便利帳欄、64(4), 480-483 (2015).

 

2. 大下 慶次郎、美齊津 文典

「クラスターのイオン移動度分析」

化学と工業、ディビジョントピックス欄、68(1), 025 (2015).

 

1. 大下 慶次郎、美齊津 文典

「移動管法を使った原子分子科学とその周辺 第4回 イオン移動度質量分析法によるクラスターイオンの構造研究」

原子衝突学会誌「しょうとつ」11(6), 148-156 (2014).

 

特許

1.  鈴木 俊法、大下 慶次郎「液体微粒子化ノズル及びそれを用いた装置」

   特許公開 2007-038124

 

受賞

1. 東北大学・青葉理学振興会賞(平成11年度)

 「アルカリ金属原子が極性溶媒により溶媒和されたクラスターの光イオン化」

 

招待講演・依頼講演

12. 「イオン移動度質量分析を用いたプロトン付加分子におけるプロトン移動反応の研究」

70回質量分析総合討論会2022、福岡、20226月(招待講演)

 

11. 「温度可変低温イオン移動度質量分析によるホスト−ゲスト錯体の異性化反応の研究」

原子衝突学会第46回年会、オンライン、202110

 

10. 「イオン移動度質量分析を用いたホスト-ゲスト化合物の構造と異性化反応の研究」

9回イオン移動度研究会、オンライン、20214

 

9. 「イオン移動度質量分析と量子化学計算による分子内長距離プロトン移動の反応経路探索」

IQCE量子化学探索講演会2020、オンライン、202011

 

8. Size selectivity of O2 adsorption on coinage metal nanocluster ions studied by mass spectrometry

平成30年度化学系学協会東北大会、秋田、20189

 

7. Structures and Reactivities of Metal Oxide Cluster Ions Studied by Ion Mobility Mass Spectrometry (IMMS)

Tohoku-Melbourne Research Workshop on Science: Recent Advances in Physical Chemistry/Chemical Physics, Sendai, November 7, 2017.

 

6. Size- and Isomer-dependent Adsorption Reactivity of Metal Oxide Cluster Ions Studied by Ion Mobility Mass Spectrometry

The 20th East Asian Workshop on Chemical Dynamics, Kaohsiung, Taiwan, June 12-15, 2016.

 

5. Structures and Reactions of Metal Oxide Cluster Ions Studied by Ion Mobility Mass Spectrometry

International Symposium on Molecular Science Physical Chemistry , Kyoto, March 26, 2016.

 

4. Structures and CO-adsorption reactivities of nickel oxide cluster ions studied by ion mobility mass spectrometry

Pacifichem 2015, Waikiki, Hawaii, December 14-18, 2015.

 

3.「イオン移動度質量分析を用いたイオン結合クラスターの構造研究」

3回イオン移動度研究会、船橋、20144

 

2.「分子クラスターの重合反応における化学反応経路」

シンポジウム「化学反応経路探索のニューフロンティア2012」、東京、20129

 

1.「金属原子からの電子移動で開始されるビニル化合物のクラスター内重合反応」

分子研研究会「立体反応ダイナミクスの新展開」、岡崎、20007

 

学内外における活動

28. 東北大学理学部化学科 オープンキャンパス実行委員(2023年)

27. 東北大学理学部化学科 一般雑誌会委員(2022年度)

26. 日本質量分析学会 イオン反応研究部会委員(2021-2024年度)

25. 日本化学会第101春季年会 プログラム小委員会編成委員(2021年)

24. 68回質量分析総合討論会 セッションサブオーガナイザー(2020年)

23. 東北大学理学部化学科 安全管理委員会副委員長補佐 (2020-2021年度)

22. 東北大学理学部化学科 教務委員(クラス担任・2年生)(2020年度)

21. 東北大学理学部化学科 懇和会委員(2018-2019年度)

20. 東北大学理学部化学科 広報委員(2018-2019年度)

19. 東北大学理学部化学科 新入生オリエンテーション実行委員(2018年度)

18. 日本化学会第98春季年会 プログラム小委員会編成委員(2017年)

17. 11回分子科学討論会実行委員(2017年)

16. 東北大学理学部化学科 パンフレット制作WG委員(2017年)

15. 東北大学理学部化学科 オープンキャンパス実行委員(2017年)

14. 東北大学理学部化学科 教務委員(クラス担任・2年生)(2017年度)

13. 化学グランプリ2016 一次選考会(宮城会場)会場担当(2016年)

12. 56回分子科学若手の会夏の学校 分科会講師(2016年)「イオン移動度分析法を中心とした気相分光実験」

11. 東北大学理学部化学科・大学院理学研究科化学専攻ホームページ刷新WG委員(2016年)

10. 東北大学理学部化学科 一般雑誌会委員(2016年度)

9. 東北化学同窓会 幹事(広報担当)(2015年度)

8. 東北大学 自然科学総合実験 副曜日責任者(2015-2016年度)

7. 東北大学 自然科学総合実験 テキスト執筆(2015-2017年度)

6. 東北大学 自然科学総合実験 課題責任者(燃料電池)(2015-2017年度)

5. 東北大学 自然科学総合実験 実施・計画委員会委員(2015-2017年度)

4. 東北大学大学院理学研究科 自修会委員(2014年度)

3. 東北大学理学部化学科 安全管理委員会副委員長補佐 (2014年度)

2. 29回化学反応討論会実行委員(2013年)

1. 25回化学反応討論会実行委員(2009年)