Desorption Dynamics of CO from VUV-irradiated Methanol Ice

发布时间：2022-07-11 13:16

　　The translational energies for photodesorbed CO（v=0）from CH₃OH ice have been measured at 157 nm to investigate photodesorption dynamics of CO（v=0）at the temperature of 8,50 and 80 K.The reproduced time-of-flight（TOF）spectrum of CO（v=0）from amorphous CH₃OH ice at 80 K was composed of three different Maxwell-Boltzmann distributions.These components were described by a fast component（A）with T_trans=1250±250K,a middle component（B）with T_trans=450±50K and a s... 

【文章页数】：52 页

【学位级别】：硕士

【文章目录】：
ABSTRACT
CHAPTER 1: INTRODUCTION
    1.1 MOLECULAR CLOUD AND INTERSTELLAR MEDIUM
    1.2 CO AND CH3OH IN THE SPACE
    1.3 PHOTODISSOCIATION OF THE SOLID-METHANOL
    1.4 RESEARCH PURPOSE
CHAPTER 2: THEORY
    2.1 FOURIER TRANSFORM REFLECTION ABSORPTION INFRARED SPECTROSCOPY
    2.2 RESONANCE ENHANCED MULTIPHOTON IONIZATION
CHAPTER 3: EXPERIMENTAL
    3.1. EXPERIMENTAL SETUP
    3.2. FORMATION OF METHANOL ICES AND INFRARED REFLECTION SPECTRUM
    3.3. TIME-OF-FLIGHT MASS SPECTROSCOPY
    3.4. MEASUREMENT OF INFRARED ABSORPTION SPECTRUM OF ICE SURFACE
CHAPTER 4: RESULTS & DISCUSSION
    4.1. DESORPTION OF CO MOLECULES FROM METHANOL ICE
        4.1.1. Time-of flight spectrum
        4.1.2. IR SPECTRUM OF IRRADIATED METHANOL ICE
        4.1.3. IRRADIATION TIME DEPENDENCE OF EACH COMPONENT
        4.1.4. TEMPERATURE DEPENDENCE OF EACH COMPONENT
    4.2. DESORPTION OF CO MOLECULES FROM CO FILM ON METHANOL ICE
    4.3. DESORPTION OF CO MOLECULES FROM CO_2 FILM ON METHANOL ICE
    4.4. DESORPTION OF CO MOLECULES FROM H_2CO (MIXED H_2O) ICE
    4.5. DESORPTION OF CO MOLECULES FROM H_2CO (MIXED H_2O) FILM ON METHANOLICE
    4.6. PHOTODESORPTION OF METHANOL FROM ICE
        4.6.1. DETECTION OF METHANOL MOLECULE
        4.6.2. CH_3OH / CO ICE
CONCLUSIONS
ACKNOWLEDGEMENTS
REFERENCES



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