Updated on 2025/07/27
博士（理学） ( 東京大学 )
修士（理学） ( 東京大学 )
The University of Tokyo doctor course completed
The University of Tokyo master course completed
The University of Tokyo graduated
茨城県立 水戸第一高等学校 graduated
2021.4 -
中央大学理工学部准教授
日本分光学会
分子科学会
日本化学会
The Coblentz Society
分光イノベーション研究会
フロー精密合成コンソーシアム
Nanotechnology/Materials / Fundamental physical chemistry
Yushi Fujimoto, Yoshifumi Mochiduki, Hikaru Sotome, Rintaro Shimada, Hajime Okajima, Yasunori Toda, Akira Sakamoto, Hiroshi Miyasaka, Fuyuki Ito
Journal of the American Chemical Society 2024.11
Hydroxyl group/fluorine disorder in deuterated magnesium hydroxyfluoride and behaviors of hydrogen bonds under high pressure Reviewed
Xuejing He, Hiroyuki Kagi, Kazuki Komatsu, Riko Iizuka-Oku, Hajime Okajima, Takanori Hattori, Asami Sano-Furukawa, Shinichi Machida, Jun Abe, Hirotada Gotou, Satoshi Nakano
Journal of Molecular Structure 2024.8
Pritam Sadhukhan, Shu-Qi Wu, Shinji Kanegawa, Sheng-Qun Su, Xiaopeng Zhang, Takumi Nakanishi, Jeremy Ian Long, Kaige Gao, Rintaro Shimada, Hajime Okajima, Akira Sakamoto, Joy G. Chiappella, Myron S. Huzan, Thomas Kroll, Dimosthenis Sokaras, Michael L. Baker, Osamu Sato
Nature Communications 14 ( 1 ) 2023.6
Photoinduced Persistent Polarization Change in a Spin Transition Crystal. Reviewed International journal
Sheng-Qun Su, Shu-Qi Wu, Yu-Bo Huang, Wen-Huang Xu, Kai-Ge Gao, Atsushi Okazawa, Hajime Okajima, Akira Sakamoto, Shinji Kanegawa, Osamu Sato
Angewandte Chemie (International ed. in English) e202208771 2022.7
Excited-state dynamics of dipyrrolyldiketone difluoroboron complexes Reviewed
Ryota Sato, Hajime Okajima, Shinya Sugiura, Yohei Haketa, Yusuke Kinoshita, Hitoshi Tamiaki, Akira Sakamoto, Hiromitsu Maeda, Yoichi Kobayashi
Physical Chemistry Chemical Physics 24 ( 3 ) 1685 - 1691 2022
Manipulating electron redistribution to achieve electronic pyroelectricity in molecular [FeCo] crystals. Reviewed International journal
Pritam Sadhukhan, Shu-Qi Wu, Jeremy Ian Long, Takumi Nakanishi, Shinji Kanegawa, Kaige Gao, Kaoru Yamamoto, Hajime Okajima, Akira Sakamoto, Michael L Baker, Thomas Kroll, Dimosthenis Sokaras, Atsushi Okazawa, Norimichi Kojima, Yoshihito Shiota, Kazunari Yoshizawa, Osamu Sato
Nature communications 12 ( 1 ) 4836 - 4836 2021.8
Macroscopic Polarization Change via Electron Transfer in a Valence Tautomeric Cobalt Complex Reviewed
Shu-Qi Wu, Meijiao Liu, Kaige Gao, Shinji Kanegawa, Yusuke Horie, Genki Aoyama, Hajime Okajima, Akira Sakamoto, Michael L. Baker, Myron S. Huzan, Peter Bencok, Tsukasa Abe, Yoshihito Shiota, Kazunari Yoshizawa, Wenhuang Xu, Hui-Zhong Kou, Osamu Sato
Nature Communications 11 ( 1 ) 2020.12
Geometrical Evolution and Formation of the Photoproduct in the Cycloreversion Reaction of a Diarylethene Derivative Probed by Vibrational Spectroscopy. Reviewed International journal
Hikaru Sotome, Hajime Okajima, Tatsuhiro Nagasaka, Yuka Tachii, Akira Sakamoto, Seiya Kobatake, Masahiro Irie, Hiroshi Miyasaka
Chemphyschem : a European journal of chemical physics and physical chemistry 21 ( 14 ) 1485 - 1485 2020.7
Front Cover: Geometrical Evolution and Formation of the Photoproduct in the Cycloreversion Reaction of a Diarylethene Derivative Probed by Vibrational Spectroscopy (ChemPhysChem 14/2020) Reviewed
Hikaru Sotome, Hajime Okajima, Tatsuhiro Nagasaka, Yuka Tachii, Akira Sakamoto, Seiya Kobatake, Masahiro Irie, Hiroshi Miyasaka
ChemPhysChem 21 ( 14 ) 1483 - 1483 2020.7
Geometrical Evolution and Formation of the Photoproduct in the Cycloreversion Reaction of a Diarylethene Derivative Probed with Molecular Vibrations Invited Reviewed
Hikaru Sotome, Hajime Okajima, Tatsuhiro Nagasaka, Yuka Tachii, Akira Sakamoto, Seiya Kobatake, Masahiro Irie, Hiroshi Miyasaka
ChemPhysChem 2020.6
Takumi Nakanishi, Yuta Hori, Shuqi Wu, Hiroyasu Sato, Atsushi Okazawa, Norimichi Kojima, Yusuke Horie, Hajime Okajima, Akira Sakamoto, Yoshihito Shiota, Kazunari Yoshizawa, Osamu Sato
Angewandte Chemie International Edition 59 ( 35 ) 14781 - 14787 2020.5
Femtosecond Polarization Switching of [CrCo] Dinuclear Complex Crystals Reviewed
Hikaru Kuramochi, Genki Aoyama, Hajime Okajima, Akira Sakamoto, Shinji Kanegawa, Osamu Sato, Satoshi Takeuchi, Tahei Tahara
Angewandte Chemie International Edition 2020.5
Photochromic Radical Complexes That Show Heterolytic Bond Dissociation Reviewed
Ryosuke Usui, Katsuya Yamamoto, Hajime Okajima, Katsuya Mutoh, Akira Sakamoto, Jiro Abe, Yoichi Kobayashi
Journal of the American Chemical Society 2020.5
Synthesis of Belt- and Möbius-Shaped Cycloparaphenylenes by Rhodium-Catalyzed Alkyne Cyclotrimerization. Reviewed International journal
Shuhei Nishigaki, Yu Shibata, Atsuya Nakajima, Hajime Okajima, Yui Masumoto, Taisei Osawa, Atsuya Muranaka, Haruki Sugiyama, Ayano Horikawa, Hidehiro Uekusa, Hiroyuki Koshino, Masanobu Uchiyama, Akira Sakamoto, Ken Tanaka
Journal of the American Chemical Society 141 ( 38 ) 14955 - 14960 2019.9
Observation of Proton Transfer Coupled Spin Transition and Trapping of Photoinduced Metastable Proton Transfer State in an Fe(II) Complex Reviewed
Nakanishi Takumi, Hori Yuta, Sato Hirorsu, Wu Shu-Qi, Okazawa Atsushi, Kojima Norimichi, Yamamoto Takashi, Einaga Yasuaki, Hayami Shinya, Horie Yusuke, Okajima Hajime, Sakamoto Akira, Shiota Yoshihito, Yoshizawa Kazunari, Sato Osamu
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 141 ( 36 ) 14384 - 14393 2019.9
Liquid Phase Pulsed Laser Ablation on Pyrite Reviewed
Yuka Motohashi, Yumi Yakiyama, Fumitaka Mafun, Hajime Okajima, Akira Sakamoto, Toshihiko Shimizu, Yuki Minami, Nobuhiko Sarukura, Hidehiro Sakurai
CHEMISTRY LETTERS 48 ( 7 ) 712 - 714 2019.7
Katsuya Yamamoto, Isshu Gomita, Hajime Okajima, Akira Sakamoto, Katsuya Mutoh, Jiro Abe
Chemical Communications 2019
Hajime Okajima, Teruo Shinmyozu, Akira Sakamoto
Physical Chemistry Chemical Physics 20 ( 5 ) 3395 - 3402 2018.2
Formation of "nano-Ice" and density maximum anomaly of water Reviewed
Hajime Okajima, Masahiro Ando, Hiro-O Hamaguchi
Bulletin of the Chemical Society of Japan 91 ( 6 ) 991 - 997 2018
Flapping viscosity probe that shows polarity-independent ratiometric fluorescence Reviewed
Ryota Kotani, Hikaru Sotome, Hajime Okajima, Soichi Yokoyama, Yumi Nakaike, Akihiro Kashiwagi, Chigusa Mori, Yuki Nakada, Shigehiro Yamaguchi, Atsuhiro Osuka, Akira Sakamoto, Hiroshi Miyasaka, Shohei Saito
JOURNAL OF MATERIALS CHEMISTRY C 5 ( 21 ) 5248 - 5256 2017.6
Direct Observation of the Ultrafast Evolution of Open-Shell Biradical in Photochromic Radical Dimer Reviewed
Yoichi Kobayashi, Hajime Okajima, Hikaru Sotome, Takeshi Yanai, Katsuya Mutoh, Yusuke Yoneda, Yasuteru Shigeta, Akira Sakamoto, Hiroshi Miyasaka, Jiro Abe
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 139 ( 18 ) 6382 - 6389 2017.5
Direct Observation of the Ultrafast Evolution of Open-Shell Biradical in Photochromic Radical Dimer Reviewed
Kobayashi, Yoichi, Okajima, Hajime, Sotome, Hikaru, Yanai, Takeshi, Mutoh, Katsuya, Yoneda, Yusuke, Shigeta, Yasuteru, Sakamoto, Akira, Miyasaka, Hiroshi, Abe, Jiro
Journal of the American Chemical Society 139 ( 18 ) 6382 - 6389 2017.4
Satyen Saha, Hajime Okajima, Osamu Homma, Hiro-o Hamaguchi
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 176 79 - 82 2017.4
Shinji Kanegawa, Yoshihito Shiota, Soonchul Kang, Kazuyuki Takahashi, Hajime Okajima, Akira Sakamoto, Tatsuya Iwata, Hideki Kandori, Kazunari Yoshizawa, Osamu Sato
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 138 ( 43 ) 14170 - 14173 2016.11
Po-Hsiung Chen, Rintaro Shimada, Sohshi Yabumoto, Hajime Okajima, Masahiro Ando, Chiou-Tzu Chang, Li-Tzu Lee, Yong-Kie Wong, Arthur Chiou, Hiro-O Hamaguchi
SCIENTIFIC REPORTS 6 ( 1 ) 20097 2016.1
Hajime Okajima, Hiro-o Hamaguchi
JOURNAL OF RAMAN SPECTROSCOPY 46 ( 11 ) 1140 - 1144 2015.11
Vitaly I. Korepanov, Henryk Witek, Hajime Okajima, Eiji Osawa, Hiro-O Hamaguchi
JOURNAL OF CHEMICAL PHYSICS 140 ( 4 ) 041107 2014.1
Chun-Fu Chang, Hajime Okajima, Hiro-o Hamaguchi, Shinsuke Shigeto
CHEMICAL COMMUNICATIONS 50 ( 85 ) 12973 - 12976 2014
Phonon mode of TiO2 coupled with the electron transfer from N3 dye Reviewed
Tomonori Nomoto, Keita Fujio, Akira Sasahara, Hajime Okajima, Naoki Koide, Hiroyuki Katayama, Hiroshi Onishi
JOURNAL OF CHEMICAL PHYSICS 138 ( 22 ) 224704 2013.6
Kaori Watanabe, Hajime Okajima, Takuya Kato, Hiro-o Hamaguchi
JOURNAL OF CHEMICAL PHYSICS 136 ( 1 ) 014508 2012.1
Unusually Long trans/gauche Conformational Equilibration Time during the Melting Process of BmimC1, a Prototype Ionic Liquid Reviewed
Hajime Okajima, Hiro-o Hamaguchi
CHEMISTRY LETTERS 40 ( 11 ) 1308 - 1309 2011.11
目で見るラマン散乱 Reviewed
岡島 元, 浜口 宏夫
日本分光学会会誌「分光研究」 60 187 - 188 2011
Sub-Second Tracing of Lattice Mode Changes During the Melting of an Anthracene Crystal Reviewed
Hajime Okajima, Hiro-o Hamaguchi
XXII INTERNATIONAL CONFERENCE ON RAMAN SPECTROSCOPY 1267 1121 - 1122 2010
Fast Low Frequency (Down to 10 cm(-1)) Multichannel Raman Spectroscopy Using an Iodine Vapor Filter Reviewed
Hajime Okajima, Hiro-O Hamaguchi
APPLIED SPECTROSCOPY 63 ( 8 ) 958 - 960 2009.8
ヨウ素フィルターを用いた低振動数マルチチャンネルラマン分光法の開発 Reviewed
岡島 元, 浜口 宏夫
日本分光学会会誌「分光研究」 58 215 - 217 2009
Local structure formation in alkyl-imidazolium-based ionic liquids as revealed by linear and nonlinear Raman spectroscopy Reviewed
Koichi Iwata, Hajime Okajima, Satyen Saha, Hiro-O Hamaguchi
ACCOUNTS OF CHEMICAL RESEARCH 40 ( 11 ) 1174 - 1181 2007.11
Low frequency Raman Spectroscopy and liquid structure of imidazolium based ionic liquids Reviewed
Hajime Okajima, Hiro-o Hamaguchi
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 231 2006.3
Multivariate Curve Resolution and Low-frequency Raman Spectroscopy: Application to Water and Crystalline Polymorphs International conference
H. Okajima
The 5th Chuo/NCU Chemistry Workshop 2025.1
近赤外光励起による低振動数ラマン分光電気化学
岳藤 光生, 岡島 元
第４０回近赤外フォーラム ( 東京 ) 2024.11
多点同時低振動数ラマン分光および多変量解析を用いた医薬品結晶多形の迅速識別とイメージング
吉本 知生, 岡島 元
テラヘルツ科学の最先端XI ( 福井 ) 2024.10
Hydrogen bond structure in liquid water studied by isotope shifts in decomposed Raman spectra
Y. Sato, H. Okajima
The 18th Annual Meeting of Japan Society for Molecular Science 2024.9
Effect of dimethyl sulfoxide as a cryoprotectant on the hydrogen bonding in cold water
A. Nagashima, Y. Sato, H. Okajima
The 18th Annual Meeting of Japan Society for Molecular Science 2024.9
Raman Spectroscopic Temperature Determination in Micro Reaction Channels Invited International conference
H. Okajima
The 9th Taiwan international Symposium on Raman Spectroscopy 2024.7
Effect of Dimethyl Sulfoxide on the Hydrogen Bonding in Water International conference
A. Nagashima, Y. Sato, H. Okajima
The 9th Taiwan international Symposium on Raman Spectroscopy 2024.7
Characterization and Imaging of Crystal Polymorphs by Single Exposure Multivariate Analysis International conference
K. Yoshimoto, H. Okajima
The 9th Taiwan international Symposium on Raman Spectroscopy 2024.7
Study of Hydrogen Bond Structures in Liquid Water by Raman Spectral Isotope Shifts International conference
Y. Sato, H. Okajima
The 9th Taiwan international Symposium on Raman Spectroscopy 2024.7
Development of a Thermal Gradient Microchannel Method for Temperature-dependent Raman Spectroscopy International conference
K. Yashiro, H. Okajima
The 9th Taiwan international Symposium on Raman Spectroscopy 2024.7
Development of channel scanning methods for efficient temperature dependent Raman spectroscopy
The Annual Meeting of the Spectroscopical Society of Japan 2024.6
Development of scanning analysis along optical axis for extracting thin-layer Raman spectra
The Annual Meeting of the Spectroscopical Society of Japan 2024.6
Multi-point low-frequency Raman spectroscopy and multivariate analysis for rapid identification of crystal polymorph
The Annual Meeting of the Spectroscopical Society of Japan 2023.10
Solvent temperature measurement by Stokes and anti-Stokes Raman spectroscopy
The Annual Meeting of the Spectroscopical Society of Japan 2023.10
Raman spectroscopy of ethanol-water mixture in a wide spectral range
The Annual Meeting of the Spectroscopical Society of Japan 2023.10
Identification of crystal polymorphs occurring in Dibenzoylmethane boron fluoride complex Using low-frequency Raman spectroscopy
The Annual Meeting of the Spectroscopical Society of Japan 2023.10
凝集誘起発光特性を有するジベンゾイルメタンフッ化ホウ素錯体の励起状態ダイナミクス
藤本 悠史, 五月女 光, 島田 林太郎, 岡島 元, 坂本 章, 宮坂 博, 伊藤 冬樹
日本化学会第103春季年会 ( 野田 ) 2023.3
A study of hydrogen-bonded structures in liquid water by simultaneous measurements and multivariate analysis of high and low-frequency Raman spectra
Yu Sato, Hajime Okajima
The 103rd CSJ Annual Meeting 2023.3
9–フェニルアントラセン(9PA)の近赤外ナノ秒過渡ラマンスペクトルにおける同位体シフトの分析による最低励起一重項状態の詳細な解析
吉澤 優花, 佐藤 宏樹, 島田 林太郎, 岡島 元, 坂本 章
第16回分子科学討論会 ( 横浜 ) 2022.9
凝集誘起発光特性を有するβ-ジケトンフッ化ホウ素錯体の励起状態ダイナミクス
藤本 悠史, 五月女 光, 島田 林太郎, 岡島 元, 坂本 章, 宮坂 博, 伊藤 冬樹
第16回分子科学討論会 ( 横浜 ) 2022.9
溶媒混合による1,2-ジクロロエタンのマイクロドメイン緩和過程のラマン分光分析
岡本 正成, 岡島 元, 島田 林太郎, 坂本 章
第16回分子科学討論会 ( 横浜 ) 2022.9
凝集誘起発光特性を有するジベンゾイルメタンフッ化ホウ素錯体の結晶多形発現過程の蛍光可視化
藤本 悠史, 望月 啓文, 松本 杏実, 五月女 光, 島田 林太郎, 岡島 元, 坂本 章, 宮坂 博, 伊藤 冬樹
2022年光化学討論会 ( 京都 ) 2022.9
ラマン分光を用いた絶対的な温度決定 Invited
岡島 元
Biothermology workshop 2019 2019.12
マイクロ流路内の化学反応と温度制御のin situ ラマン分光分析; イミダゾリウム系イオン液体の精密合成の追跡
岡島 元
第13回分子科学討論会 2019.9
蛍光性メカノクロミック錯体ジベンゾイルメタンフッ化ホウ素誘導体の急冷凝固アモルファス中に生じるマイクロ結晶のラマン分光分析
松本 陽太郎, 岡島 元, 伊藤 冬樹, 坂本 章
第13回分子科学討論会 2019.9
高精度低振動数ラマン分光法の開発とその基礎物理化学的応用 Invited
岡島 元
2019年度 日本分光学会年次講演会 2019.5
Evaporative Crystallization of 4,4?-Di-tert-Buthyldibenzoylmethanatoboron Difluoride Observed by Low-Frequency Micro-Raman Spectroscopy International conference
Y. Matsumoto, H. Okajima, F. Ito, A. Sakamoto
The 26th International Conference on Raman Spectroscopy ( Jeju, Korea ) 2018.8
Near-infrared Transient Raman Spectroscopy of Electronic Excited Sumanene International conference
H. Sato, M. Takatori, H. Okajima, S. Higashibayashic, H. Sakurai, A. Sakamoto
The 26th International Conference on Raman Spectroscopy ( Jeju, Korea ) 2018.8
Formation of Nano-ice in Low-Temperature Liquid Water as Revealed by Multivariate Hyperspectral Analysis of Temperature Determined Raman Spectra International conference
Hajime Okajima, Masahiro Ando, Hiro-o Hamaguchi
The 26th International Conference on Raman Spectroscopy ( Jeju, Korea ) 2018.8
Determination of absolute configurations of binaphthyl derivatives in solution by Raman optical activity spectroscopy International conference
S. Itami, H. Okajima, A. Sakamoto
The 5th Taiwan International Symposium on Raman Spectroscopy ( Chiayi, Taiwan ) 2017.6
Femtosecond Time-resolved Infrared Absorption Study on Photoexcited Dynamics of Regioregular Poly(3-hexylthiophene) in Solutions International conference
G. Aoyama, H. Okajima, A. Sakamoto
The 5th Taiwan International Symposium on Raman Spectroscopy ( Chiayi, Taiwan ) 2017.6
Measurements and analyses of infrared absorption spectra of the anionic species of benzophenone derivatives International conference
A. Shimomura, H. Okajima, A. Sakamoto
The 5th Taiwan International Symposium on Raman Spectroscopy ( Chiayi, Taiwan ) 2017.6
Near-infrared Resonance Raman Spectroscopy of Excited Triphenylene, a Symmetric Polycyclic Aromatic Hydrocarbon International conference
Hajime Okajima, Akira Sakamoto
The 5th Taiwan International Symposium on Raman Spectroscopy ( Chiayi, Taiwan ) 2017.6
Development of Raman spectroelectrochemical system for tracing formation processes of radical ions International conference
I. Gomita, H. Okajima, A. Sakamoto
The 5th Taiwan International Symposium on Raman Spectroscopy ( Chiayi, Taiwan ) 2017.6
近赤外共鳴低振動数ラマン分光による非局在電子を伴う大振幅振動の分析 Invited
岡島 元
日本分光学会年次講演会『テラヘルツ分光技術の最先端応用』 ( 早稲田 ) 2017.5
Infrared absorption study on the radical anions of triphenylene and sumanenetrion; prototypes of planar and non-planar conjugated molecules International conference
A. Shimomura, H. Okajima, N. Takashina, S. HIgashibayashi, H. Sakurai, A. Sakamoto
The 4th Taiwan International Symposium on Raman Spectroscopy ( Taipei, Taiwan ) 2016.6
Application of Raman imaging apparatus to vibrational spectroelectrochemistry International conference
I. Gomita, H. Okajima, A. Sakamoto
The 4th Taiwan International Symposium on Raman Spectroscopy ( Taipei, Taiwan ) 2016.6
Determination of absolute configurations of polyaromatic chiral molecules by Raman optical activity (ROA) spectroscopy International conference
S. Itami, H. Okajima, S. Kubota, K. Nakano, A. Sakamoto
The 4th Taiwan International Symposium on Raman Spectroscopy ( Taipei, Taiwan ) 2016.6
Femtosecond Time-resolved Infrared Absorption Study on Photo-excited Dynamics of Regioregular Poly(3-hexylthiophene) International conference
G. Aoyama, H. Okajima, A. Sakamoto
The 4th Taiwan International Symposium on Raman Spectroscopy ( Taipei, Taiwan ) 2016.6
マルチチャンネル検出による動的かつ高精度な低振動数ラマン分光 Invited
岡島 元
日本分光学会テラヘルツ分光部会シンポジウム『テラヘルツ科学の最先端Ⅱ』 ( 作並 ) 2015.11
Optical Resolution and Identification of Chiral Molecules by Vibrational Circular Dichroism (VCD) Spectroscopy International conference
K. Fujita, H. Okajima, Y. Hamada, A. Sakamoto
The 3rd Taiwan International Symposium on Raman Spectroscopy ( Nantou, Taiwan ) 2015.7
Selective Observation of Large Amplitude Inter-Ring Vibrations: Resonance Raman Spectroscopy of Cyclophane Radical Cation Invited International conference
Hajime Okajima
The 3rd Taiwan International Symposium on Raman Spectroscopy, ( Nantou, Taiwan ) 2015.7
Real-time Temperature Tracing during Solid/Liquid Phase Transition by Low-frequency Raman Spectroscopy International conference
Hajime Okajima, Hiro-o Hamaguchi
the 4th Asian Spectroscopy Conference ( Singapore ) 2013.12
Absolute Temperature Determination from Stokes/anti-Stokes Raman Scattering of Water International conference
Hajime Okajima, Hiro-o Hamaguchi
7th International Conference on Advanced Vibrational Spectroscopy ( Kobe, Japan ) 2013.8
Absolute Temperature Determination from Stokes/anti-Stokes Raman Scattering of Water Invited International conference
Hajime Okajima
The 1st Taiwan International Symposium on Raman Spectroscopy ( Hsinchu, Taiwan ) 2013.7
ラマン分光を用いた混合系・非定常系の分子種選択的な新しい温度測定 Invited
岡島 元
第35回溶液化学シンポジウム プレシンポジウム ( 早稲田 ) 2012.11
Real-time Tracing of Water Temperature by Low-frequency Stokes/anti-Stokes Raman Scattering Invited International conference
Hajime Okajima, Takuto Hirosaki, Hiro-o Hamaguchi
The 2nd Hsinchu Symposium on Advanced Spectroscopy and Imaging in Molecular Science ( Hsinchu, Taiwan ) 2012.7
Non-uniform Thermal Equilibration and Local Structure Formation in Ionic Liquids; A Study by Stokes/anti-Stokes Raman Spectroscopy International conference
Hajime Okajima, Hiro-o Hamaguchi
The 3rd Asian Spectroscopy Conference ( Xiamen, China ) 2011.11
Sub-second tracing of lattice mode changes during the melting of an anthracene crystal International conference
Hajime Okajima, Hiro-o Hamaguchi
22nd International conference on Raman spectroscopy ( Boston, USA ) 2010.8
Fast (second~millisecond) Low Frequency Raman Spectroscopy for Real-time Tracing of Melting Process International conference
Hajime Okajima, Hiro-o Hamaguchi
International Symposium on Advanced Spectroscopy and Imaging in Molecular Science ( Hsinchu, Taiwan ) 2010.6
マルチチャンネル低振動数ラマン分光の開発とイオン液体の液体構造研究 Invited
岡島 元
先端的レーザー分光若手シンポジウム ( 和光 ) 2008.12
Low frequency multi-channel Raman spectroscopy with an iodine vapor filter International conference
Hajime Okajima, Hiro-o Hamaguchi
FACSS 2008 Conference ( Reno, USA ) 2008.9
Multi-channel low frequency Raman spectroscopy using an iodine vapor filter for Rayleigh scattering elimination International conference
Hajime Okajima, Hiro-o Hamaguchi
21st International conference on Raman spectroscopy ( London, UK ) 2008.8
Development and application of multichannel low frequency Raman spectroscopy International conference
Hajime Okajima, Hiro-o Hamaguchi
16th International Symposium of SNU-UT-NTU Chemistry Department ( Saul, Korea ) 2008.2
Low frequency Raman spectroscopy of ionic liquids International conference
Hajime Okajima, Hiro-o Hamaguchi
2nd International Congress on Ionic Liquids ( Yokohama, Japan ) 2007.8
Tracing molecular interactions in microfluidic channels: Development and application of focus modulation spectroscopic analysis
Grant number：24K08482 2024.4 - 2027.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C) Chuo University
Grant amount： \4550000 （ Direct Cost: \3500000 、 Indirect Cost： \1050000 ）
In situ analysis of microchemical reactions by temperature and material combination Raman spectral imaging
Grant number：21K18857 2021.7 - 2023.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory) Chuo University
Grant amount： \6500000 （ Direct Cost: \5000000 、 Indirect Cost： \1500000 ）
Structure and electronic-state of the liquid-like cluster observed during solvent evaporative crystallization process
Grant number：19H02686 2019.4 - 2022.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B) Shinshu University
Ito Fuyuki
Grant amount： \17940000 （ Direct Cost: \13800000 、 Indirect Cost： \4140000 ）
We have previously reported the molecular dynamics of the crystallization process based on the fluorescence changes during the evaporative crystallization. These results support the two-step nucleation mechanism based on the fluorescence spectral changes from the monomer in solution to the crystal via an amorphous-like intermediate. In this study, we elucidate the structure and properties of the amorphous-like intermediate. The key intermediate liquid-like cluster state for the two-step nucleation mechanism is visualized by the fluorescence color changes of dibenzoylmethanatoboron difluoride derivatives. Three types of emissive species (Crystal, BG-aggregates, and Amorphous) are generated from monomers in solution via liquid-like clusters during solvent evaporation. In terms of crystallization dynamics, our results indicate that it is important not only to generate supersaturated states, but also to maintain the survival time of the liquid-like cluster.
Formation of "nano-ice", ultra-small ice crystallite in liquid water, elucidated by Raman spectroscopy
Grant number：19H02679 2019.4 - 2022.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Okajima Hajime
Grant amount： \17810000 （ Direct Cost: \13700000 、 Indirect Cost： \4110000 ）
We have developed a novel approach, "microdroplet Raman flow imaging," to investigate the hydrogen bonding structures in water. This technique enables us to precisely determine the temperature of solutions in microchannels of μm order and monitor recombinations of intermolecular interactions (equilibration of liquid structure). By analyzing the spectral components of water that were separated using multivariate analysis, we found the structural relationship between one of the components and ice. Furthermore, our method provided a quantitative analysis of the change of hydrogen bonding due to the electrolyte addition and how it corresponds to changes in the components’ composition.
Near-infrared resonance low-frequency Raman spectroscopy for elucidating inter-molecular interactions induced by solvated electrons
Grant number：15K17810 2015.4 - 2017.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B) Aoyama Gakuin University
Okajima Hajime
Grant amount： \4160000 （ Direct Cost: \3200000 、 Indirect Cost： \960000 ）
I developed near-infrared resonance low-frequency Raman spectroscopy to investigate large amplitude inter- and/or intra-molecular vibrations in resonance with electronic absorptions of delocalized electrons such as solvated electrons, and applied it to several molecular systems. One application is a study of radical cation of a model molecule of benzene dimer. It is found that one of the inter-ring vibrations is observed with strong Raman intensity. This vibration changes the distance of two benzene rings and, thus, couples with the delocalized electron in the two benzene rings. The other application is a study of electronic excited phenylantracenes. Large amplitude anthracene ring vibrations of these molecules are selectively observed because of the resonance enhancement of the delocalized electron on the anthracene rings. This highly-sensitive and highly-selective spectroscopy seems useful to investigate particular inter-molecular vibrations coupled with delocalize electrons.
分子同士の弱い結合生成機構の解明にむけたμ秒時間分解低振動数ラマンイメージング
Grant number：26888015 2014.8 - 2015.3
日本学術振興会 科学研究費助成事業 研究活動スタート支援 青山学院大学
岡島 元
Grant amount： \1300000 （ Direct Cost: \1000000 、 Indirect Cost： \300000 ）
本研究課題の目的は、振動分光に基づいて溶媒の混合過程を観測する新しいイメージング技術を確立することであった。そのために、ラマンイメージング技術と連続フローシステムとを組み合わせた「連続フローラマンイメージング」装置の開発と、さらにそれを分子間結合の領域（低振動数領域）へ拡張することを計画した。本年度は、連続フローラマンイメージング装置の開発を行い、基本的な溶媒についての混合過程、特に混合初期過程での分子分布の変化が追跡可能であることを確認した。
石英製のY字型マイクロ流路（マイクロリアクター）を用いた連続フローシステムを導入し、それを既存のラマンイメージング装置と組み合わせた。2つの流入口からベンゼンとシクロヘキサンとをそれぞれ流し、2液の合流点付近を数十 μmスケールの空間分解能でラマン分光測定したところ、2つの分子種に由来するラマンバンドが現れる空間分布を測定することができた。特に、混合後の数cm（数秒間に相当）の距離において、2種類のラマンバンドの空間分布が流路の両側に片寄ったままであることが確認された。これは2つの分子種がどのような空間分布を経て混合するかについての情報を与える。さらに、両者のバンドが観測される箇所のラマンスペクトルを詳細に調べることにより、空間分布が重なる（見かけの）混合後の溶媒環境の変化を分子レベルで知ることができる。
Real-time investigation on the melting dynamics of aromatic molecular crystals by using fast Low-frequency Raman spectroscopy
Grant number：22850003 2010 - 2011
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity Start-up The University of Tokyo
HAJIME Okajima
Grant amount： \3120000 （ Direct Cost: \2400000 、 Indirect Cost： \720000 ）
We showed that a transient crystalline structure of anthracene exists in its melting. Lattice vibrations of the'' super-heated'' crystal, which is only seen during the melting, are different to those of the stationary state. We improved the fast low frequency Raman spectroscopy for simultaneous monitoring the optical image of the sample under microscope. It enables sub-second time-resolved and micrometer space-resolved tracing of the appearance(or disappearance) of lattice vibrations with simultaneous monitoring the morphology changes. It will be a new method for molecular-level and real-time tracing structural change of a small crystal during its phase transitions.
Development of time-and space-resolved low frequency Raman spectroscopy and elucidation of melting processes of ionic liquids
Grant number：21245005 2009 - 2011
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A) The University of Tokyo
HAMAGUCHI Hiro-o, IWATA Koichi, OKAJIMA Hajime
Grant amount： \49660000 （ Direct Cost: \38200000 、 Indirect Cost： \11460000 ）
We developed a new low frequency Raman spectroscopy for elucidating melting processes of ionic liquids. It enables fast and simultaneous monitoring of various aspects of melting : increase of temperatures, loss of lattice vibrations, and intramolecular structure change. Several new phenomena are found,(1) a transient crystalline state existing at temperatures higher than the melting point,(2) delay of intramolecular conformational changes during the melting, and(3) thermal non-equilibration of anions and cations in an ionic liquid. The third result will lead to a new concept,"molecular temperature", which is useful for discussing thermal inhomogeneity of general liquids as well as ionic liquids.
