| Summary: | 碩士 === 國立中央大學 === 物理研究所 === 99 === In this thesis, absorption and fluorescence emission spectra of carbon dioxide have been studied using synchrotron radiation light source from 6m-high flux beamline at SRRC, Taiwan. Photoabsorption cross section of carbon dioxide at wavelength 62 – 120 nm has been derived. Absorption and fluorescence measurement also has been used to assign Rydberg states converging to CO2+ (X2 ?g1/2), Tanaka-Ogawa series converging to CO2+ (A 2?u), Henning Diffuse and Sharp series converging to CO2+ (B 2?u+), and TJL series converging to CO2+ (C2?g+). Ionization potential (IP) for CO2+ ionic state has been derived from this assignment, such as IP for CO2+ (A 2?u) is 17.36 eV, IP for CO2+ (B 2?u+) is 18.07 eV, and IP for CO2+ (C2?g+) is 19.39 eV. From the fluorescence spectrum, we observed fourth positive band as a emission of CO (A1??– X1?+) at 69 – 80 nm incident photon energy. O(1S) production from CO2 photodissociation in the wavelength range 105 – 120 nm has also been observed using high pressure Xenon to enhance O(1S) to O(1D) transition. From this result we observed that CO2 1?u+ be a challenging photodissociation channel of O(1S) and we also suggest that 3p? 1?u states may be a channel to produce O(1S).
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