大下 慶次郎 (Keijiro OHSHIMO)

 

経歴

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

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

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., in press (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, in press (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, 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

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

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 Chemisitry , 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