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Photodissociation Dynamics of CH3 Radical and High Resolution Spectroscopic Study of the S-R(0,0) Band in O2

Author: WuGuoRong
Tutor: YangXueMing;ShaGuoHe
School: Dalian Institute of Chemical Physics
Course: Physical and chemical
Keywords: Radical H Atom Rydberg Tagging Time-of-Flight Laser-Induced Fluorescence Cavity Ring-Down Spectroscopy
CLC: O641.1
Type: PhD thesis
Year: 2005
Downloads: 81
Quote: 0
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Abstract


Photodissociation dynamics of the CH3 radical at 212.5 nm excitation hasbeen studied experimentally using the H atom Rydberg tagging time-of-flightmethod. Photodissociation of CH3I at 266nm was used to generate pure CH3radical. Product translational energy distribution and angular anisotropydistribution for the CH2 product from CH3 photodissociation at differentvibrational levels via the 3s Rydberg state have been measured. From thesedistributions, product J state distributions are obtained for decomposition ofdifferent vibrationally excited CH3 radicals. Effect of parent vibrational as wellas rotational excitation on the dissociation dynamics of CH3 is also investigated indetail.During the auther’s Ph.D. procedure, another important experiment workhas been done: high resolution spectroscopic study of the Schumann-Runge(0,0)band in O2. With the use of a novel Titanium:sapphire laser source delivering,upon fourth harmonic generation, narrowband and tunable radiation in thedeep-UV, spectroscopic, dissociation and collisional studies were performed onthe weak Schumann-Runge (0,0) band of oxygen. From a combination ofLaser-Induced Fluorescence and Cavity Ring-Down spectroscopy observations,accurate information on collisional effects and fine-structure dependentpredissociation was obtained for the excited B(v = 0) state.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Structural Chemistry > Chemical bond theory
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