IWASA, Takeshi

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IWASA, Takeshi
Assistant Professor
Faculty of Science, Hokkaido University
TAKETSUGU, Tetsuya Group
Principal Investigator
Faculty Members
Postdoctoral Fellows
Research Collaborators
Staff

About the Research

Research Theme

Interaction between localized light and molecules and Excited states

Keyword

Near-field spectroscopy and dynamics, Optical response theory, Cluster compounds

Representative Research Achievements

  • Single-molecule resonance Raman effect in a plasmonic nanocavity
    R. B. Jaculbia, H. Imada*, K. Miwa, T. Iwasa, M. Takenaka, B. Yang, E. Kazuma, N. Hayazawa*, T. Taketsugu, Y. Kim*, Nat. Nanotechnol., 2020, 15, 105-110
    DOI: 10.1038/s41565-019-0614-8
  • Combined Automated Reaction Pathway Searches and Sparse Modeling Analysis for Catalytic Properties of Lowest Energy Twins of Cu13
    T. Iwasa*, T. Sato, M. Takagi, M. Gao, A. Lyalin, M. Kobayashi, K. Shimizu, S. Maeda, T. Taketsugu*, J. Phys. Chem. A, 2019, 123, 210-217
    DOI: 10.1021/acs.jpca.8b08868
  • First principles calculations toward understanding SERS of 2,2′-bipyridyl adsorbed on Au, Ag and Au-Ag alloy
    M. Takenaka, Y. Hashimoto, T. Iwasa*, T. Taketsugu, G. Seniutinas, A. Balčytis, S. Juodkazise, Y. Nishijima*, J. Comput. Chem., 2019, 40, 925-932
    DOI: 10.1002/jcc.25603
  • Time-Dependent Density Functional Theory Study on Higher Low-Lying Excited States of Au25(SR)18–
    M. Ebina, T. Iwasa*, Y. Harabuchi, T. Taketsugu*, J. Phys. Chem. C, 2018, 122, 4097-4104
    DOI: 10.1021/acs.jpcc.7b12723
  • Generalized theoretical method for the interaction between arbitrary nonuniform electric field and molecular vibrations: Toward near-field infrared spectroscopy and microscopy
    T. Iwasa*, M. Takenaka, and T. Taketsugu, J. Chem. Phys., 2016,  144, 124116 [8 pages]
    DOI: 10.1063/1.4944937

Related Research

Publications

2023

  • Key Factors for Connecting Silver-Based Icosahedral Superatoms by Vertex Sharing
    S. Miyajima, S. Hossain, A. Ikeda, T. Kosaka, T. Kawawaki, Y. Niihori, T. Iwasa, T. Taketsugu, Y. Negishi, Communications Chemistry, 2023, 6, Article number: 57
    DOI: 10.1038/s42004-023-00854-0

2022

  • Excited States of Metal-Adsorbed Dimethyl Disulfide: A TDDFT Study with Cluster Model
    K. Toda, Y. Hirose, E. Kazuma, Y. Kim, T. Taketsugu, T. Iwasa, J. Phys. Chem. A, 2022, 126, 4191-4198
    DOI: 10.1021/acs.jpca.2c023544191
  • Doping-Mediated Energy-Level Engineering of M@Au-12 Superatoms (M=Pd, Pt, Rh, Ir) for Efficient Photoluminescence and Photocatalysis
    H. Hirai, S. Takano, T. Nakashima, T. Iwasa, T. Taketsugu, T. Tsukuda, Angew. Chem., Int. Ed., 2022, 61,
    DOI: 10.1002/anie.202207290

2021

  • Barium Oxide Encapsulating Cobalt Nanoparticles Supported on Magnesium Oxide: Active Non-Noble Metal Catalysts for Ammonia Synthesis under Mild Reaction Conditions
    K. Sato, S. Miyahara, K. Tsujimaru, Y. Wada, T. Toriyama, T. Yamamoto, S. Matsumura, K. Inazu, H. Mohri, T. Iwasa, T. Taketsugu, K. Nagaoka, Acs Catalysis, 2021, 11, 13050-13061
    DOI: 10.1021/acscatal.1c02887
  • Structural Characterization of Nickel-Doped Aluminum Oxide Cations by Cryogenic Ion Trap Vibrational Spectroscopy
    Y. K. Li, M. C. Babin, S. Debnath, T. Iwasa, S. Kumar, T. Taketsugu, K. R. Asmis, A. Lyalin, D. M. Neumark, J. Phys. Chem. A, 2021, 125, 9527-9535
    DOI: 10.1021/acs.jpca.1c07156
  • A Comparative Study of Structural, Electronic, and Optical Properties of Thiolated Gold Clusters with Icosahedral vs Face-Centered Cubic Cores
    M. Miyamoto, T. Taketsugu, T. Iwasa, J. Chem. Phys., 2021, 155,
    DOI: 10.1063/5.0057566
  • Single-Molecule Laser Nanospectroscopy with Micro-Electron Volt Energy Resolution
    H. Imada, M. Imai-Imada, K. Miwa, H. Yamane, T. Iwasa, Y. Tanaka, N. Toriumi, K. Kimura, N. Yokoshi, A. Muranaka, M. Uchiyama, T. Taketsugu, Y. K. Kato, H. Ishihara, Y. Kim, Science, 2021, 373, 95-+
    DOI: 10.1126/science.abg8790
  • Ag23Pd2(PPh3)(10)Cl-7 (0): A New Family of Synthesizable Bi-Icosahedral Superatomic Molecules
    S. Hossain, S. Miyajima, T. Iwasa, R. Kaneko, T. Sekine, A. Ikeda, T. Kawawaki, T. Taketsugu, Y. Negishi, J. Chem. Phys., 2021, 155,
    DOI: 10.1063/5.0057005
  • Theoretical Method for Near-Field Raman Spectroscopy with Multipolar Hamiltonian and Real-Time-TDDFT: Application to On- and Off-Resonance Tip-Enhanced Raman Spectroscopy
    M. Takenaka, T. Taketsugu, T. Iwasa, J. Chem. Phys., 2021, 154, 14
    DOI: 10.1063/5.0034933
  • Effects of Support Materials and Ir Loading on Catalytic N2O Decomposition Properties
    S. Hinokuma, T. Iwasa, Y. Kon, T. Taketsugu, K. Sato, Catalysis Communications, 2021, 149,
    DOI: 10.1016/j.catcom.2020.106208

2020

  • Ammonia Combustion Properties of Copper Oxides-Based Honeycomb and Granular Catalysts
    S. Hinokuma, T. Iwasa, K. Araki, Y. Kawabata, S. Matsuki, T. Sato, Y. Kon, T. Taketsugu, K. Sato, M. Machida, Journal of the Japan Petroleum Institute, 2020, 63, 274-281
    DOI: 10.1627/jpi.63.274
  • Single-Molecule Resonance Raman Effect in a Plasmonic Nanocavity
    RB. Jaculbia, H. Imada, K. Miwa, T. Iwasa, M. Takenaka, B. Yang, E. Kazuma, N. Hayazawa, T. Taketsugu, Y. Kim, Nat. Nanotechnol., 2020, 15, 105-110
    DOI: 10.1038/s41565-019-0614-8
  • N2O Decomposition Properties of Ru Catalysts Supported on Various Oxide Materials and SnO2
    S. Hinokuma, T. Iwasa, Y. Kon, T. Taketsugu, K. Sato, Scientific Reports, 2020, 10,
    DOI: 10.1038/s41598-020-78744-x
  • Photoinduced Pyramidal Inversion Behavior of Phosphanes Involved with Aggregation-Induced Emission Behavior
    T. Machida, T. Iwasa, T. Taketsugu, K. Sada, K. Kokado, Chem. Eur. J., 2020, 26, 8028-8034
    DOI: 10.1002/chem.202000264
  • Combined Computational Quantum Chemistry and Classical Electrodynamics Approach for Surface Enhanced Infrared Absorption Spectroscopy
    M. Takenaka, T. Taketsugu, T. Iwasa, J. Chem. Phys., 2020, 152, 8
    DOI: 10.1063/1.5143855

2019

  • Low-Lying Excited States of HqxcH and Zn-Hqxc Complex: Toward Understanding Intramolecular Proton Transfer Emission
    M. Ebina, Y. Kondo, T. Iwasa, T. Taketsugu, Inorg. Chem., 2019, 58, 4686-4698
    DOI: 10.1021/acs.inorgchem.9b00410
  • Combined Automated Reaction Pathway Searches and Sparse Modeling Analysis for Catalytic Properties of Lowest Energy Twins of Cu13
    T. Iwasa, T. Sato, M. Takagi, M. Gao, A. Lyalin, M. Kobayashi, K. Shimizu, S. Maeda, T. Taketsugu, J. Phys. Chem. A, 2019, 123, 210-217
    DOI: 10.1021/acs.jpca.8b08868
  • Photoluminescence Properties of [Core plus exo]-Type Au-6 Clusters: Insights into the Effect of Ligand Environments on the Excitation Dynamics
    Y. Shichibu, MZ. Zhang, T. Iwasa, Y. Ono, T. Taketsugu, S. Omagari, T. Nakanishi, Y. Hasegawa, K. Konishi, J. Phys. Chem. C, 2019, 123, 6934-6939
    DOI: 10.1021/acs.jpcc.9b01810
  • Roles of Silver Nanoclusters in Surface-Enhanced Raman Spectroscopy
    T. Tsuneda, T. Iwasa, T. Taketsugu, J. Chem. Phys., 2019, 151, 094102
    DOI: 10.1063/1.5111944