Showing papers by "Yutaka Matsumi published in 1997"
TL;DR: Bimolecular rate constants for the reaction of ground-state Cl(2P3/2) atoms and for quenching of excited spin−orbit state Cl*( 2P1/2), in collisions with CH4, CD4, and CH2D2 have been measured in this article.
Abstract: Bimolecular rate constants for the reaction of ground-state Cl(2P3/2) atoms and for quenching of excited spin−orbit state Cl*(2P1/2) atoms in collisions with CH4, CD4, and CH2D2 have been measured ...
44 citations
TL;DR: The photofragment excitation (PHOFEX) spectrum for O(1D) production from the photolysis of ozone under supersonic free-jet conditions was measured, scanning the photodissociation wavelength in the region of 305-329 nm and probing the O( 1D) atoms by vacuum ultraviolet laser induced fluorescence at 115.2 nm.
Abstract: The photofragment excitation (PHOFEX) spectrum for O(1D) production from the photolysis of ozone under supersonic free-jet conditions was measured, scanning the photodissociation wavelength in the region of 305–329 nm and probing the O(1D) atoms by vacuum ultraviolet laser induced fluorescence at 115.2 nm. The bond dissociation energy D00(O2–O) was determined to be 101.53±0.25 kJ mol−1 from the cut-off wavelength in the PHOFEX spectrum for the photodissociation of jet-cooled ozone (Trot≈5 K) to O(1D)+O2(a 1Δg). The cut-off wavelength for vibrationally hot band excitation to the dissociative continuum of O(1D)+O2(a 1Δg) was also observed in the PHOFEX spectrum. It was found that the active mode for the hot band excitation was the antisymmetric stretching mode ν3 in the ground electronic state of ozone. Sharp peaks corresponding to vibrational bands in the Huggins system were also observed in the PHOFEX spectrum of the O(1D) atoms produced via the spin-forbidden dissociation process, O(1D)+O2(X 3∑g−). The s...
42 citations
TL;DR: In this article, the ion-pair photodissociation R+ + X- (R = CH3, C2H5 and X = Cl, Br) from their respective alkyl halides has been studied using ion photofragment imaging spectroscopy at 118.27 nm.
Abstract: The ion-pair photodissociation R+ + X- (R = CH3, C2H5 and X = Cl, Br) from their respective alkyl halides has been studied using ion photofragment imaging spectroscopy at 118.27 nm. From the struct...
36 citations
TL;DR: In this article, the photodissociation dynamics of the ion dimer at 355 nm was studied with photofragment imaging spectroscopy for the product CH3Br+ and the center of mass translational energy distribution was represented by a Gaussian distribution that peaks at 25 kcal mol-1.2.
Abstract: Photodissociation of (CH3Br)2+ was studied at 355 nm with photofragment imaging spectroscopy for the product CH3Br+. The center-of-mass translational energy distribution is represented by a Gaussian distribution that peaks at 25 kcal mol-1. The angular distribution is characterized by the anisotropy parameter β = 1.8 ± 0.2. Photodissociation dynamics of the ion dimer at 355 nm is discussed.
8 citations
TL;DR: In this paper, a probe laser was used to excite O(2p3Pj) atoms to the O(3s3So) state at 130.212 nm.
Abstract: O atoms in the 3P2 state were detected by vacuum ultraviolet laser-induced fluorescence (VUV LIF) technique. The O(3P2) atoms were produced by the collision between the O atoms in the 1D excited state and collision partner N2. O atoms in the 1D excited state were obtained by photodissociation of N2O at 193 nm laser light. As O(3P2) species has their first transition in the VUV region, the probe laser was used to excite O(2p3Pj) atoms to the O(3s3So) state at 130.212 nm. A four wave difference frequency mixing (2ω1−ω2) process using Kr as nonlinear media was employed to generate 130.212 nm probe laser light.