"Hikaru Takayanagi,Jean-Xavier Bardaud,Keisuke Hirata,Val?rie Brenner,Eric Gloaguen,Shun-ichi Ishiuchi,Masaaki Fujii","Stepwise hydration of [CH3COOMg]+ studied by cold ion trap infrared spectroscopy: insights into interactions in the magnesium channel selection filters",,"Physical Chemistry Chemical Physics",," 25",,"pp. 23923-23928",2023,Aug.
"Kien X. Vo,Keisuke Hirata,James M. Lisy,Shun-ichi Ishiuchi,Masaaki Fujii","Infrared Spectra of Beauvericin-Alkaline Earth Metal Ion Complexes─Ion Preference to Physiological Ions",,"The Journal of Physical Chemistry A",,"Volume 127","Issue 34","pp. 7115?7120",2023,Aug.
"Keisuke Hirata,Eiko Sato,James M. Lisy,Shun-ichi Ishiuchi,Masaaki Fujii","Ion Recognition beyond Size Matching: Cooperative Hydration Effect on the K+ Selectivity of Valinomycin over Na+ Revealed by Cryogenic Double Ion Trap Infrared Spectroscopy",,"The Journal of Physical Chemistry Letters","American Chemical Society","Volume 14","Issue 24","pp. 5567?5572",2023,June
"Satoru Tanabe,Keisuke Hirata,Koichi Tsukiyama,James M. Lisy*,Shun-ichi Ishiuchi*,Masaaki Fujii*","Can Ag+ Permeate through a Potassium Ion Channel? A Bottom-Up Approach by Infrared Spectroscopy of the Ag+ Complex with the Partial Peptide of a Selectivity Filter",,"The Journal of Physical Chemistry Letters","American Chemical Society","Vol. 14","No. 11","pp. 2886-2890",2023,Mar.
"Yukina Suzuki,Keisuke Hirata,James M. Lisy,Shun-ichi Ishiuchi,Masaaki Fujii","Thermodynamics and Kinetics of a Partial Peptide of K+ Channels: DFT Transition State Calculations Coupled with Temperature-Controlled Gas Phase Laser Spectroscopy",,"Bulletin of the Chemical Society of Japan","The Chemical Society of Japan","Vol. 96","No. 3","pp. 310-317",2023,Feb.
"Kyota Akasaka,Keisuke Hirata,Fuad Haddad,Otto Dopfer,Shun-ichi Ishiuchi,Masaaki Fujii","Hydration-induced protomer switching in p-aminobenzoic acid studied by double ion trap infrared spectroscopy",,"Physical Chemistry Chemical Physics","The Royal Society of Chemistry","Vol. 25","No. 6","pp. 4481-4488",2022,Dec.
"Keisuke Hirata,Eiko Sato,James M. Lisy,Shun-ichi Ishiuchi,Masaaki Fujii","Cation-responsive cavity expansion of valinomycin revealed by cryogenic ion trap infrared spectroscopy",,"Physical Chemistry Chemical Physics","The Royal Society of Chemistry","Vol. 25","No. 2","pp. 1075-1080",2022,Dec.
"Kien X. Vo,Keisuke Hirata,James M. Lisy,Shun-ichi Ishiuchi,Masaaki Fujii","Na+ selective binding by beauvericin and its mechanism studied by mass-coupled cold ion trap infrared spectroscopy",,"The Journal of Physical Chemistry Letters","American Chemical Society","Vol. 13","No. 48","pp. 11330-11334",2022,Dec.
"大倉由楓,平田圭祐,石内俊一,築山光一,藤井正明","プロトン化ニコチン類似体とその水和クラスターの冷却イオントラッ プ・赤外分光",,,,,,,2022,Nov.
"田邊悟,平田圭祐,James M. Lisy,石内俊一,築山光一,藤井正明","K+チャネル選択フィルター部分ペプチド(GYG)-Ag+錯体の冷却イオントラップ赤外分光",,,,,,,2022,Nov.
"Kien Vo,Keisuke Hirata,James Lisy,Shun-ichi Ishiuchi,Masaaki Fujii","Ion Selectivity of Beauvericin and its Mechanism Studied by Mass-coupled Cold Ion Trap Infrared Spectroscopy and Computational Study","第16回分子科学討論会",,,,,,2022,Sept.
"Franco Molina,Jordan Dezalay,Jun-ichi Tabata,Satchin Soorkia,Michel Broquier,Keisuke Hirata,Shun-ichi Ishiuchi,Masaaki Fujii,Gilles Gr?goire","Conformer-selective photodynamics of TrpH+-H2O",,"ChemPhysChem","John Wiley & Sons, Ltd","Vol. 24","No. 2","pp. e202200561",2022,Sept.
"Keisuke Yamaguchi,Keisuke Hirata,Shun-ichi Ishiuchi,Masaaki Fujii","Ultraviolet and infrared spectra of mono-, di- and tri-hydrated clusters of protonated noradrenaline ? Solvation and conformational variations",,"Chemical Physics Letters",,"Vol. 806",,"pp. 140014",2022,Sept.
"Koki Yoshizawa,Keisuke Hirata,Shun-ichi Ishiuchi,Masaaki Fujii,Anne Zehnacker","Do Stereochemical Effects Overcome a Charge-induced Perturbation in Isolated Protonated cyclo(Tyr-Tyr)?",,"The Journal of Physical Chemistry A","American Chemical Society","Vol. 126","No. 37","pp. 6387-6394",2022,Sept.
"田邊 悟,平田 圭祐,Lisy James M.,石内 俊一,築山 光一,藤井 正明","K+チャネル選択フィルター部分ペプチド(GYG)-タリウム錯体の冷却イオントラップ赤外分光","第16回分子科学討論会",,,,,,2022,Sept.
"赤阪 恭汰,佐野 晃,石川 春樹,平田 圭祐,石内 俊一,藤井 正明","プロトン化ベンゾカインの冷却イオントラップ赤外分光 ―プロトマースイッチングの溶媒依存性―","第16回分子科学討論会",,,,,,2022,Sept.
"王 君成,田邊 悟,平田 圭祐,石内 俊一,藤井 正明","IR-IR dip２重共鳴分光のためのリフレクトロン型タンデム飛行時間型質量分析器の開発","第16回分子科学討論会",,,,,,2022,Sept.
"黄 初恵,平田 圭祐,藤井 正明,石内 俊一","エレクトロスプレー・冷却イオントラップ法による アセチルコリン-受容体部分ペプチド複合体の 気相分光","第16回分子科学討論会",,,,,,2022,Sept.
"早川 優里花,平田 圭祐,藤井 正明,石内 俊一","カルシウムイオンチャネル選択フィルター部分ペプチド-金属イオン錯体の冷却イオントラップ赤外分光","第16回分子科学討論会",,,,,,2022,Sept.
"田畑 純一,平田 圭祐,藤井 正明,石内 俊一,Gr?goire Gilles","プロトン付加トリプトファン水和クラスターの冷却イオントラップ分光 -励起状態緩和に対する水和効果とコンフォメーション効果-","第16回分子科学討論会",,,,,,2022,Sept.
"大倉 由楓,平田 圭祐,石内 俊一,築山 光一,藤井 正明","プロトン化ニコチン類似体の冷却イオントラップ赤外分光","第16回分子科学討論会",,,,,,2022,Sept.
"平田 圭祐,鈴木 雪菜,James M. Lisy,石内 俊一,藤井 正明","K+チャネル選択フィルター部分ぺプチドーアルカリ金属錯体の冷却イオントラップ赤外分光ーK+選択性に対する温度効果ー","第16回分子科学討論会",,,,,,2022,Sept.
"吉沢 幸毅,平田 圭祐,石内 俊一,Zehnacker-rentien Anne,藤井 正明","LL-及びLD-シクロジチロシンの冷却イオントラップ分光ーキラリティに対するプロトン化の影響ー","第16回分子科学討論会",,,,,,2022,Sept.
"Yukina Suzuki,Keisuke Hirata,James M. Lisy,Shun-ichi Ishiuchi,Masaaki Fujii","A bottom-up approach to the ion recognition mechanism of K+ channels from laser spectroscopy of hydrated partial peptide?alkali metal ion complexes",,"Physical Chemistry Chemical Physics","The Royal Society of Chemistry","Vol. 24","No. 35","pp. 20803-20812",2022,Aug.
"Garrett D. Santis,Naoya Takeda,Keisuke Hirata,Kazuya Tsuruta,Shun-ichi Ishiuchi,Sotiris S. Xantheas,Masaaki Fujii","Structure of Gas Phase Monohydrated Nicotine: Implications for Nicotine’s Native Structure in the Acetylcholine Binding Protein",,"Journal of the American Chemical Society","American Chemical Society","Vol. 144","No. 37","pp. 16698-16702",2022,Aug.
"Shun Ito,Yuriko Tasaka,Katsunosuke Nakamura,Yuki Fujiwara,Keisuke Hirata,Kiichirou Koyasu,Tatsuya Tsukuda","Electron Affinities of Ligated Icosahedral M13 Superatoms Revisited by Gas-Phase Anion Photoelectron Spectroscopy",,"The Journal of Physical Chemistry Letters",,"Volume 13","Issue 22","p. 5049",2022,June
"Keisuke Hirata,Shun Ito,Kuenhee Kim,Katsunosuke Nakamura,Hirokazu Kitazawa,Shun Hayashi,Kiichirou Koyasu,Tatsuya Tsukuda","Correction to “Photoinduced Thermionic Emission from [M25(SR)18]− (M = Au, Ag) Revealed by Anion Photoelectron Spectroscopy”",,"The Journal of Physical Chemistry","Americal Chemical Society","Volume 126","Issue 20","p. 8965",2022,May
"Keisuke Hirata,Ken-ichi Kasai,Koki Yoshizawa,Gilles Gr?goire,Shun-ichi Ishiuchi,Masaaki Fujii","Excited state dynamics of protonated dopamine: Hydration and conformation effects",,"Physical Chemistry Chemical Physics","Royal Society of Chemistry","Volume 24","Issue 18","p. 10737",2022,May
"Naoya Takeda,Keisuke Hirata,Kazuya Tsuruta,Garrett D. Santis,Sotiris S. Xantheas,Shun-ichi Ishiuchi,Masaaki Fujii","Gas phase protonated nicotine is a mixture of pyridine- and pyrrolidine-protonated conformers: implications for its native structure in the nicotinic acetylcholine receptor",,"Physical Chemistry Chemical Physics","Americal Chemical Society","Volume 24","Issue 10","p. 5786",2022,Mar.
"Keisuke Hirata,Fuad Haddad,Otto Dopfer,Shun-ichi Ishiuchi,Masaaki Fujii","Collision-assisted stripping for determination of microsolvation-dependent protonation sites in hydrated clusters by cryogenic ion trap infrared spectroscopy: the case of benzocaineH+(H2O)n",,"Physical Chemistry Chemical Physics","Royal Society of Chemistry","Volume 24","Issue 10","p. 5774",2022,Mar.
"Keisuke Hirata","“Probing protonation site switching in hydrated clusters by cryogenic ion spectroscopy: The case of p-aminobenzoic acid derivatives","2nd International Symposium of JSPS Core-to-Core Program on “Molecular Recognition Mechanism between Flexible Molecules”",,,,,,2022,Mar.
"Yukina Suzuki,Keisuke Hirata,James M. Lisy,Shun-ichi Ishiuchi,Masaaki Fujii","Double Ion Trap Laser Spectroscopy of Alkali Metal Ion Complexes with a Partial Peptide of the Selectivity Filter in K+ Channels─Temperature Effect and Barrier for Conformational Conversions",,"The Journal of Physical Chemistry A","Americal Chemical Society","Volume 125","Issue 44","p. 9567",2021,Dec.
"Keisuke Hirata,Eiko Sato,Shun-ichi Ishiuchi,Masaaki Fujii","Vibrational spectroscopy of hydrated clusters of valinomycin-metal complexes: Watching single water hydration","Pacifichem 2021",,,,,,2021,Dec.
"Keisuke Hirata,Ken-ichi Kasai,Gilles Gr?goire,Shun-ichi Ishiuchi,Masaaki Fujii","Hydration-controlled excited-state relaxation in protonated dopamine studied by cryogenic ion spectroscopy",,"The Journal of Chemical Physics","American Institute of Physics","Volume 155","Issue 15","p. 151101",2021,Oct.
"平田?圭祐,Haddad?Fuad,Dopfer?Otto,石内?俊一,藤井?正明","プロトン化ベンゾカイン水和クラスターの冷却イオントラップ赤外分光ー水和による分子内プロトン移動ー","第15回分子科学討論会",,,,,,2021,Sept.
"武田直也,平田圭祐,石内俊一,Sotiris Xantheas,藤井正明","K?チャネル選択フィルター部分ペプチド(GYG)-金属錯体の冷却イオントラップ赤外分光 −Ag?錯体の特異性−","第15回分子科学討論会",,,,,,2021,Sept.
"武田直也,平田圭祐,石内俊一,Sotiris Xantheas,藤井正明","プロトン付加ニコチン水和クラスターのエレクトロスプレー・冷却イオントラップ分光 −プロトン移動と同位体効果−","第15回分子科学討論会",,,,,,2021,Sept.
"鈴木雪菜,平田圭祐,James M. Lisy,石内俊一,藤井正明","K?チャネル選択フィルター部分ぺプチド-アルカリ金属イオン錯体水和クラスターの冷却イオントラップ分光 ーイオン選択性に対する水和効果ー","第15回分子科学討論会",,,,,,2021,Sept.
"吉沢幸毅,平田圭祐,石内俊一,Anne Zehnacker-Rentien,藤井正明","LL及びLDシクロジチロシンの冷却イオントラップ赤外分光 ―プロトン・アルカリ金属イオン付加と光学異性―",,,,,,,2021,Sept.
"高柳 光,平田 圭祐,石内 俊一,藤井 正明","カルボン酸-マグネシウムは何個の水分子で電離するか？ ?水和クラスターの冷却イオントラップ赤外分光?","第15回分子科学討論会",,,,,,2021,Sept.
"赤阪恭汰,Haddad Fuad,Dopfer Otto,佐野晃,石川春樹,平田圭祐,石内俊一,藤井正明","プロトン化p-アミノ安息香酸水和クラスターの冷却イオントラップ赤外分光 ―水和によるプロトマースイッチングー","第15回分子科学討論会",,,,,,2021,Sept.
"千葉大雅,角田瑠輝,平田圭祐,石内俊一,吉沢道人,築山光一,藤井正明","分子認識する芳香環カプセルの冷却イオン赤外分光 ー性ホルモン識別メカニズムー","第15回分子科学討論会",,,,,,2021,Sept.
"Kien?Vo,Keisuke?Hirata,James?Lisy,Shun-ichi?Ishiuchi,Masaaki?Fujii","Cold ion trap infrared spectroscopy of Beauvericin metal complexes - Ionic radius dependence of conformations","第15回分子科学討論会",,,,,,2021,Sept.
"大古拡弥,花市峻咲,平田圭祐,石内俊一,藤井正明","アドレナリン受容体部分ペプチドーリガンド複合体の冷却イオン分光 ?分子認識のアミノ酸配列依存性?","第15回分子科学討論会",,,,,,2021,Sept.
"平田圭祐","冷却イオントラップ赤外分光法による分子内プロトン移動反応の分子論的理解","日本分光学会 先端レーザー分光部会 第15回 若手研究者による先端的レーザー分光シンポジウム",,,,,,2021,July
"Takumi Negoro,Keisuke Hirata,James M. Lisy,Shun-ichi Ishiuchi,Masaaki Fujii","Potassium and Sodium Ions Complexes with a Partial Peptide of the Selectivity Filter in K+ Channels Studied by Cold Ion Trap Infrared Spectroscopy: Effect of Hydration",,"Phys. Chem. Chem. Phys.",,"Vol. 23","Issue 21","pp. 12045-12050",2021,June
"Eiko Sato,Keisuke Hirata,James M. Lisy,Shun-ichi Ishiuchi,Masaaki Fujii","Rethinking Ion Transport by Ionophores: Experimental and Computational Investigation of Single Water Hydration in Valinomycin-K+ Complexes",,"J. Phys. Chem. Lett.",,"Vol. 12","No. 6","pp. 1754-1758",2021,Feb.
"Keisuke Hirata,Yuta Mori,Shun-ichi Ishiuchi,Masaaki Fujii,Anne Zehnacker","Chiral discrimination between tyrosine and β-cyclodextrin revealed by cryogenic ion trap infrared spectroscopy",,"Phys. Chem. Chem. Phys.",,"Vol. 22","No. 43","pp. 24887-24894",2020,Nov.
"武田直也,寉田知弥,平田圭祐,石内俊一,Sotiris Xantheas,藤井正明","プロトン付加ノルニコチン水和クラスターのエレクトロスプレー・冷却イオントラップ分光?プロトン付加位置に対する水和効果?","2020年度日本分光学会年次講演会",,,,,,2020,Oct.
"高柳光,平田圭祐,石内俊一,藤井正明","カルボン酸-マグネシウム水和クラスターの冷却イオントラップ赤外分光?何個の水分子で電離するか？?","2020年度日本分光学会年次講演会",,,,,,2020,Oct.
"大古 拡弥,田端 みずき,James Lisy,吉森 篤史,中野 洋文,平田 圭祐,石内 俊一,藤井 正明","天然変性タンパク質α シヌクレイン部分ペプチド?リガンド複合体の冷却イオン分光 ?リガンド結合によって誘起される二次構造の探索?","分子科学会 オンライン討論会",,,,,,2020,Sept.
"森 優太,平田 圭祐,石内 俊一,藤井 正明,Anne Zehnacker-Rentien","冷却イオン分光法によるシクロデキストリン包接錯体の気相分光-キラル選択性の解明-","分子科学会 オンライン討論会",,,,,,2020,Sept.
"三井 聡一郎,平田 圭祐,石内 俊一,藤井 正明","分子動力学法と量子化学計算を用いたプロトン付加ノルアドレナリン水和クラスター配座異性体の網羅的探索","分子科学会 オンライン討論会",,,,,,2020,Sept.
"Jordan Dezalay,Michel Broquier,Satchin Soorkia,Keisuke Hirata,Shun-ichi Ishiuchi,Masaaki Fujii*,Gilles Gr?goire*","Excited-state proton transfer in protonated adrenaline revealed by cryogenic UV photodissociation spectroscopy",,"Phys. Chem. Chem. Phys.",,"Vol. 22","Issue 20","pp. 11498-11507",2020,May
"Remina Otsuka,Keisuke Hirata,Yuta Sasaki,James M. Lisy,Shun-ichi Ishiuchi,Masaaki Fujii","Alkali and alkaline earth metal ions complexes with a partial peptide of the selectivity filter in K+ channels studied by a cold ion trap infrared spectroscopy",,"ChemPhysChem",,,,,2020,Apr.
"Keisuke Hirata","Electron Binding in a Superatom with a Repulsive Coulomb Barrier: The Case of [Ag44(SC6H3F2)30]4? in the Gas Phase",,"The Journal of Physical Chemistry Letters",,,,,2020,Apr.
"笠井 賢一,平田 圭祐,石内 俊一,藤井 正明","プロトン付加ドーパミン水和クラスターの冷却イオントラップ分光?励起状態緩和に対する水和効果?","第13回分子科学討論会",,,,,,2019,Sept.
"佐藤 映虹,平田 圭祐,石内 俊一,藤井 正明","冷却イオントラップ法によるバリノマイシンーアルカリ金属イオン水和クラスターの赤外分光","第13回分子科学討論会",,,,,,2019,Sept.
"三井 聡一郎,加賀屋 舜,平田 圭祐,石内 俊一,藤井 正明","プロトン付加アドレナリン水和クラスターの冷却イオントラップ分光 ?コンフォメーションに対する水和効果?","第13回分子科学討論会",,,,,,2019,Sept.
"吉永 達哉,平田 圭祐,高柳 光,武田 直也,石内 俊一,築山 光一,藤井 正明","カルボン酸ーアルカリ土類金属クラスターの冷却イオントラップ分光ー電離過程に対する水和効果ー","第13回分子科学討論会",,,,,,2019,Sept.
"大塚 玲美奈,平田 圭祐,James M. Lisy,石内 俊一,藤井 正明","カリウムイオンチャネル選択フィルター部分ペプチド-アルカリ土類金属錯体の冷却イオントラップ赤外分光","第13回分子科学討論会",,,,,,2019,Sept.
"根来 拓己,福井 義光,平田 圭祐,James M. Lisy,石内 俊一,藤井 正明","カリウムイオンチャネル選択フィルター部分ペプチドーアルカリ金属錯体の冷却イオントラップ分光ー錯形成に対する水和効果","第13回分子科学討論会",,,,,,2019,Sept.
"田端 みずき,吉森 篤史,中野 洋文,平田圭祐,石内 俊一,藤井 正明","天然変性タンパク質αシヌクレイン部分ペプチド?低分子リガンド複合体の冷却イオントラップ分光?リガンド結合による二次構造誘起","第13回分子科学討論会",,,,,,2019,Sept.
"田村 将人,大古 拡弥,森 優太,関口 翼,平田 圭祐,石川 春樹,石内 俊一,藤井 正明","アドレナリン受容体部分ペプチド・リガンド錯体の冷却イオントラップ分光","第13回分子科学討論会",,,,,,2019,Sept.
"Kuenhee Kim,Keisuke Hirata,Katsunosuke Nakamura,Hirokazu Kitazawa,Shun Hayashi,Kiichirou Koyasu,Tatsuya Tsukuda","Elucidating the Doping Effect on the Electronic Structure of Thiolate-Protected Silver Superatoms by Photoelectron Spectroscopy",,,,,,,2019,June
"Keisuke Hirata,Ryohei Tomihara,Kuenhee Kim,Kiichirou Koyasu,Tatsuya Tsukuda","Characterization of chemically modified gold and silver clusters in gas phase",,,,,,,2019,June
"Keisuke Hirata,Kuenhee Kim,Katsunosuke Nakamura,Hirokazu Kitazawa,Shun Hayashi,Kiichirou Koyasu,Tatsuya Tsukuda","Photoinduced Thermionic Emission from [M25(SR)18]− (M = Au, Ag) Revealed by Anion Photoelectron Spectroscopy",,,,,,,2019,Apr.
"Keisuke Hirata,Papri Chakraborty,Abhijit Nag,Shinjiro Takano,Kiichirou Koyasu,Thalappil Pradeep,Tatsuya Tsukuda","Interconversions of Structural Isomers of [PdAu8(PPh3)8]2+ and [Au9(PPh3)8]3+ Revealed by Ion Mobility Mass Spectrometry",,,,,,,2018,Sept.
"Ryohei Tomihara,Keisuke Hirata,Hiroki Yamamoto,Shinjiro Takano,Kiichirou Koyasu,Tatsuya Tsukuda","Collision-Induced Dissociation of Undecagold Clusters Protected by Mixed Ligands [Au11(PPh3)8X2]+ (X = Cl, C≡CPh)",,,,,,,2018,June
"Keisuke Hirata,Keishiro Yamashita,Satoru Muramatsu,Shinjiro Takano,Keijiro Ohshimo,Toshiyuki Azuma,Ryuzo Nakanishi,Takashi Nagata,Seiji Yamazoe,Kiichirou Koyasu,Tatsuya Tsukuda","Anion photoelectron spectroscopy of free [Au25(SC12H25)18]−",,,,,,,2017,Aug.
"Keisuke Hirata","Fluorescent azadipyrrinato zinc(ii) complex: hybridisation with a dipyrrinato ligand",,,,,,,2012,Oct.