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using ns pulsed UV laser; Dependence of chemical kinetics on laser pulse energySaeki, Morihisa*; Yomogida, Takumi; Matsumura, Daiju; Nakanishi, Ryuzo*; Taguchi, Tomitsugu*; Tsuji, Takuya; Saito, Hiroyuki*; Oba, Hironori*
no journal, ,
In the absence of a photoactivator, the laser-induced particle formation in an H
O/ EtOH solution of PdCl was performed by three kinds of irradiation condition using fourth harmonics of the pulsed UV laser (266 nm). In the irradiation, pulsed laser energy was arranged to 5, 10 and 25 mJ, where average laser power is kept to 250 mW. The reaction kinetics of the laser-induced particle formation was observed using dispersive XAFS measurement. About half of Pd ions were reduced with 5 mJ pulsed laser irradiation. In contrast, all Pd ions were reduced with 25 mJ pulsed laser irradiation. The result elucidates that the laser photon contributes to the generation of Pd metals by the multi-photon process.
O nanoclusters combined with ONIOM calculationYamakawa, Koichiro; Nasu, Hirokazu*; Arakawa, Ichiro*
no journal, ,
Using an apparatus for terahertz- (THz-) and infrared- (IR-) spectroscopy in an ultrahigh vacuum, we measured absorption spectra of D
O nanoclusters isolated in an Ar matrix and examined dependence of the spectrum on the DO dilution and annealing temperature. The dilution of Ar/DO was in the range of 100-1000, and the annealing temperature was increased from 15 K to 25 K. Comparing the spectrum in the THz region with the IR range, where spectral assignments have been well established, we assigned the THz absorption peaks due to the intermolecular fundamentals of (DO)
with 
= 2-4. To support the assignments, we also performed the ab initio calculation with the "our own N-layered integrated molecular orbital and molecular mechanics (ONIOM)" method, where flexibility of surrounding Ar atoms was systematically incorporated.