A study of the effects of multiple leaders : From viewpoints of leaders' intragroup and intergroup behavior(Department of Sciences for Biospheric Coexistence)

博士学位論文要

Carbon-chain Free Radicals Studied by Laser and Microwave Spectroscopy

報告番号: 甲11625 ; 学位授与年月日: 1996-03-29 ; 学位の種別: 課程博士 ; 学位の種類: 博士(理学) ; 学位記番号: 博総合第88号 ; 研究科・専攻: 総合文化研究科広域科学専

Kinetics and Dynamics on the Formation of S_2(X^3Σ^-_g, a^1Δ_g) in the S(^1D) + OCS Reaction

Selective detection of single vibrational level of the X and a states of S2. Detection of highly vibrationally excited S2(X, a) generated in the S(1D) + OCS reaction. About half of the available energy is deposited into the vibrational motion of S2(X, a). Determination of the overall rate coefficient for the S(1D) + OCS reaction.学会名:22nd International Symposium on Gas Kinetics ; 会期:2012年6月18日(月)～22日(金) ; 開催地:アメリカ,コロラド州,ボールダー(Boulder) ; 発表者:Katsuyoshi Yamasaki ; 発表形式:ポスタ

Direct determination of the rate coefficient for the reaction of O(D-1) with OCS

A gaseous mixture of O-3/OCS/He was irradiated at 266 nm with a pulsed laser, and vibrationally excited SO(X-3 Sigma, v = 8 and 19) generated in the reaction of O(D-1) with OCS was detected with the laser-induced fluorescence (LIF) via the B-3 Sigma -X-3 Sigma system. The apparent production rates of SO(v = 8) in the initial reaction time and their OCS pressure dependence have been measured, giving the absolute overall rate coefficient for the O(D-1) + OCS reaction

Nascent Vibrational Energy Distribution of CS(X¹Σ⁺) Generated in the S(¹D) + CS₂ Reaction

The internal energy distributions of reaction products are important information in clarifying the mechanism of chemical reactions. There are few reports of the nascent vibrational energy distribution of CS(X1Σ+) generated in the S(1D) + CS2 reaction. As long as S(1D) is produced by photodissociation of CS2, CS(X1Σ+), as a product of the chemical reaction and as a photoproduct of CS2 is indistinguishable. In this study, S(1D) was generated by the photolysis of OCS at 248 nm, where CS2 hardly dissociates, and CS(X1Σ+) was generated only by the S(1D) + CS2 reaction. The vibrational levels v″ = 0–6 of CS(X1Σ+) were detected with laser-induced fluorescence (LIF) via the A1Π–X1Σ+ transition. The identical time profiles of the LIF intensities showed that all the vibrational levels were produced by the S(1D) + CS2 reaction. The relative nascent vibrational populations of CS(X1Σ+) determined from the area intensities of the excitation spectra are 1.00 ± 0.11/0.58 ± 0.06/0.31 ± 0.03/0.078 ± 0.009/0.013 ± 0.001/v″ = 5 and 6 are the upper limits) for v″ = 0/1/2/3/4/5/6. The distribution agrees well with the statistical (prior) distribution

Nascent Vibrational Energy Distribution of CS(X¹Σ⁺) Generated in the S(¹D) + CS₂ Reaction

The internal energy distributions of reaction products are important information in clarifying the mechanism of chemical reactions. There are few reports of the nascent vibrational energy distribution of CS(X1Σ+) generated in the S(1D) + CS2 reaction. As long as S(1D) is produced by photodissociation of CS2, CS(X1Σ+), as a product of the chemical reaction and as a photoproduct of CS2 is indistinguishable. In this study, S(1D) was generated by the photolysis of OCS at 248 nm, where CS2 hardly dissociates, and CS(X1Σ+) was generated only by the S(1D) + CS2 reaction. The vibrational levels v″ = 0–6 of CS(X1Σ+) were detected with laser-induced fluorescence (LIF) via the A1Π–X1Σ+ transition. The identical time profiles of the LIF intensities showed that all the vibrational levels were produced by the S(1D) + CS2 reaction. The relative nascent vibrational populations of CS(X1Σ+) determined from the area intensities of the excitation spectra are 1.00 ± 0.11/0.58 ± 0.06/0.31 ± 0.03/0.078 ± 0.009/0.013 ± 0.001/v″ = 5 and 6 are the upper limits) for v″ = 0/1/2/3/4/5/6. The distribution agrees well with the statistical (prior) distribution

Enhancement of the NH2 + NO → OH + H + N2 Reaction by Vibrational Excitation of NH2

LIF detection of H, OH and NH2 in the NH2 + NO reaction system. Enhancement of the NH2 + NO → OH + H + N2 reaction by vibrational excitation of NH2. (Observation of the significant reduction of the yield of OH by an addition of CF4.)学会名:22nd International Symposium on Gas Kinetics ; 会期:2012年6月18日(月)～22日(金) ; 開催地:アメリカ,コロラド州,ボールダー(Boulder) ; 発表者:Nanase Kohno ; 発表形式:ポスター ; 備考:JPC Poster Award受

N–H and N–C Bond Dissociation Pathways in Ultraviolet Photodissociation of Dimethylamine

We investigated the interlinked N–H and N–C photochemistry of primary and secondary amines via the state-resolved detection of vibrationally excited CH3 product and H atom product by 200–235 nm dimethylamine photodissociation using resonance-enhanced multiphoton ionization (REMPI) and velocity map imaging (VMI) techniques. The out-of-plane bending (ν2) vibrationally excited CH3 showed a bimodal translational energy distribution that became unimodal with a near-zero product yield at longer photolysis wavelengths (λphotolysis). In contrast, a unimodal distribution was observed for the C–H stretching (νCH) vibrationally excited CH3 products with an almost constant product yield in the examined λphotolysis region. We ascribed the state-specific energy releases of the CH3 products to two reaction pathways based on calculations of the potential energy surface (PES): the direct N–CH3 dissociation pathway and the indirect N–CH3 dissociation pathway via the N–H bond conical intersection. Meanwhile, the H atom product showed a bimodal energy distribution similar to the ammonia photodissociation model, with an excited-state counterproduct channel that became accessible at a shorter λphotolysis. These results suggest that the N–H and N–C bond dissociations are connected, and these dissociations cause different photochemistry between primary/secondary amines and tertiary amines