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KOBAYASHI T. Advanced time-resolved absorption spectroscopy with an ultrashort visible/near IR laser and a multi-channel lock-in detector. PROCEEDINGS OF THE JAPAN ACADEMY. SERIES B, PHYSICAL AND BIOLOGICAL SCIENCES 2021; 97:236-260. [PMID: 33980754 PMCID: PMC8141836 DOI: 10.2183/pjab.97.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 02/17/2021] [Indexed: 06/12/2023]
Abstract
Ultrashort visible-near infrared (NIR) pulse generation and its applications to ultrafast spectroscopy are discussed. Femtosecond pulses of around 800 nm from a Ti:sapphire laser are used as a pump of an optical parametric amplifier (OPA) in a non-collinear configuration to generate ultrashort visible (500-780 nm) pulses and deep-ultraviolet (DUV, 259-282 nm) pulses. The visible-NIR pulses and DUV pulses were compressed to 3.9 fs and 10.4 fs, respectively, and used to elucidate various ultrafast dynamics in condensed matter with a sub-10 fs resolution by pump-probe measurements. We have also developed a 128-channel lock-in amplifier. The combined system of the world-shortest visible pulse from the OPA and the lock-in amplifier with the world-largest channel-number can clarify the sub-10 fs-dynamics in condensed matter. This system clarified structural changes in an excited state, reaction intermediate, and a transition state. This is possible even during molecular vibration and reactions via a real-time-resolved vibronic spectrum, which provides molecular structural change information. Also, ultrafast dynamics in exotic materials like carbon nanotubes, topological insulators, and novel solar battery systems have been clarified. Furthermore, the carrier-envelope phase in the ultrashort pulse has been controlled and measured.
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Affiliation(s)
- Takayoshi KOBAYASHI
- Center for Neuroscience and Biomedical Engineering, The University of Electro-Communications, Chofu, Tokyo, Japan
- Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan
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Yamakita Y, Yokoyama N, Xue B, Shiokawa N, Harabuchi Y, Maeda S, Kobayashi T. Femtosecond electronic relaxation and real-time vibrational dynamics in 2′-hydroxychalcone. Phys Chem Chem Phys 2019; 21:5344-5358. [DOI: 10.1039/c8cp06405a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electronic relaxation, proton transfer and instantaneous vibrational frequency change after the impulsive excitation by a deep ultraviolet 9 fs pulse were studied.
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Affiliation(s)
- Yoshihiro Yamakita
- Department of Engineering Science
- Graduate School of Informatics and Engineering
- The University of Electro-Communications
- Tokyo 182-8585
- Japan
| | - Nanae Yokoyama
- Department of Engineering Science
- Graduate School of Informatics and Engineering
- The University of Electro-Communications
- Tokyo 182-8585
- Japan
| | - Bing Xue
- Department of Engineering Science
- Graduate School of Informatics and Engineering
- The University of Electro-Communications
- Tokyo 182-8585
- Japan
| | - Naoyuki Shiokawa
- Department of Engineering Science
- Graduate School of Informatics and Engineering
- The University of Electro-Communications
- Tokyo 182-8585
- Japan
| | - Yu Harabuchi
- Department of Chemistry
- Faculty of Science
- Hokkaido University
- Sapporo 060-0810
- Japan
| | - Satoshi Maeda
- Department of Chemistry
- Faculty of Science
- Hokkaido University
- Sapporo 060-0810
- Japan
| | - Takayoshi Kobayashi
- Brain Science Inspired Life Support Research Center
- The University of Electro-Communications
- Tokyo 182-8585
- Japan
- Department of Electrophysics
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Reimers JR, Hush NS. Relating transition-state spectroscopy to standard chemical spectroscopic processes. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.04.070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Hashimoto S, Yabushita A, Iwakura I. Transient process spectroscopy for the direct observation of inter-molecular photo-dissociation. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2017; 4:054901. [PMID: 28580369 PMCID: PMC5433884 DOI: 10.1063/1.4983639] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 05/04/2017] [Indexed: 06/07/2023]
Abstract
Transient process spectroscopy has previously been thought to be applicable only to the analysis of intra-molecular processes. Two metal ion bridges used in the present work have allowed us to visualize real-time variations of the molecular vibration frequencies during photo-disproportionation inside bimolecule aggregates, which directly shows transient inter-molecular reactions.
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Affiliation(s)
- Sena Hashimoto
- Department of Applied Chemistry, Graduate School of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Yokohama 221-8686, Japan
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Two-dimensional observation of multicolor multistep photoreaction process by using white light excitation covering entire visible region. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2016.09.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Best SP, Wang F, Islam MT, Islam S, Appadoo D, Trevorah RM, Chantler CT. Reinterpretation of Dynamic Vibrational Spectroscopy to Determine the Molecular Structure and Dynamics of Ferrocene. Chemistry 2016; 22:18019-18026. [PMID: 27734528 DOI: 10.1002/chem.201603823] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Indexed: 11/10/2022]
Abstract
Molecular distortion of dynamic molecules gives a clear signature in the vibrational spectra, which can be modeled to give estimates of the energy barrier and the sensitivity of the frequencies of the vibrational modes to the reaction coordinate. The reaction coordinate method (RCM) utilizes ab initio-calculated spectra of the molecule in its ground and transition states together with their relative energies to predict the temperature dependence of the vibrational spectra. DFT-calculated spectra of the eclipsed (D5h ) and staggered (D5d ) forms of ferrocene (Fc), and its deuterated analogue, within RCM explain the IR spectra of Fc in gas (350 K), solution (300 K), solid solution (7-300 K), and solid (7-300 K) states. In each case the D5h rotamer is lowest in energy but with the barrier to interconversion between rotamers higher for solution-phase samples (ca. 6 kJ mol-1 ) than for the gas-phase species (1-3 kJ mol-1 ). The generality of the approach is demonstrated with application to tricarbonyl(η4 -norbornadiene)iron(0), Fe(NBD)(CO)3 . The temperature-dependent coalescence of the ν(CO) bands of Fe(NBD)(CO)3 is well explained by the RCM without recourse to NMR-like rapid exchange. The RCM establishes a clear link between the calculated ground and transition states of dynamic molecules and the temperature-dependence of their vibrational spectra.
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Affiliation(s)
- Stephen P Best
- School of Chemistry, University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Feng Wang
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, Melbourne, Victoria, 3122, Australia
| | - M Tauhidul Islam
- School of Chemistry, University of Melbourne, Parkville, Victoria, 3010, Australia.,School of Physics, University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Shawkat Islam
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, Melbourne, Victoria, 3122, Australia
| | - Dominique Appadoo
- Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria, 3168, Australia
| | - Ryan M Trevorah
- School of Physics, University of Melbourne, Parkville, Victoria, 3010, Australia
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Iwakura I, Yabushita A. Development of Novel Reactions Induced by Coherent Molecular Vibrational Excitation and Direct Observation of Molecular Structural Change during “Thermal” Reactions. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2016. [DOI: 10.1246/bcsj.20150242] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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