Tsuyoshi Asahi
Ehime University
195 Papers
2.7K Citations
Tsuyoshi Asahi is an academic researcher from Ehime University. The author has contributed to research in topics: Femtosecond & Nanoparticle. The author has an hindex of 42, co-authored 192 publications. Previous affiliations of Tsuyoshi Asahi include University of Texas at Austin & École Normale Supérieure.
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Papers
Charge Carrier Dynamics of Standard TiO2 Catalysts Revealed by Femtosecond Diffuse Reflectance Spectroscopy
TL;DR: In this article, the dynamics of charge carriers generated by femtosecond UV (160 fs, 390 nm) excitation in five standard TiO2 photocatalytic powders (JRC-TIO-1, -2, -3, -4, and -5 supplied by the Catalysis Society of Japan) in a vacuum and air was investigated by means of time-resolved femto-cond diffuse reflectance spectroscopy, and discussed from the viewpoints of crystal structure (anatase and rutile), particle size, and surrounding condition around the
271
Laser Fabrication and Spectroscopy of Organic Nanoparticles
TL;DR: This Account describes recent advances in laser technology both for the synthesis of organic nanoparticles and for their analysis by single nanoparticle spectroscopy and proposes "structural confinement" as an analogous paradigm fororganic nanoparticles.
208
The bell-shaped energy gap dependence of the charge recombination reaction of geminate radical ion pairs produced by fluorescence quenching reaction in acetonitrile solution
TL;DR: In this article, the authors made systematic studies on the charge recombination processes of geminate ion pairs by directly observing their dynamics with ultrafast laser spectroscopy, and they obtained not only the results for the inverted region, but also the results of the top region as well as normal region, confirming the bell-shaped energy gap dependence of the recombination.
200
Intramolecular photoinduced charge separation and charge recombination of the product ion pair states of a series of fixed-distance dyads of porphyrins and quinones: energy gap and temperature dependences of the rate constants
Tsuyoshi Asahi,Masaya Ohkohchi,Ryohzi Matsusaka,Noboru Mataga,Run Ping Zhang,Atsuhiro Osuka,Kazuhiro Maruyama +6 more
TL;DR: In this paper, photo-induced charge separation (CS) and charge recombination (CR) of the product ion pair (IP) state of a series of fixed-distance dyads consisting of free-base porphyrin or zinc porphrin and quinones have been investigated by means of picosccond-femtosecond laser spectroscopies in order to examine the energy gap and temperature dependences of CS and CR reactions in nonpolar media.
189
Charge recombination process of ion pair state produced by excitation of charge-transfer complex in acetonitrile solution. Essentially different character of its energy gap dependence from that of geminate ion pair formed by encounter between fluorescer and quencher
Tsuyoshi Asahi,Noboru Mataga +1 more
189