| Summary: | 碩士 === 國立中央大學 === 化學研究所 === 93 === New dispersed fluorescence spectra following the excitation of several HCBr and DCBr A-X vibronic bands were successfully obtained in a supersonic free jet expansion with an intensified charge-coupled device (ICCD) detector. These dispersed fluorescence spectra show signal-to-noise ratios up to 100 and reveal the complete and detailed vibrational structure of the ground state including the previously unreported C-H/C-D stretch vibrational mode. The emission bands to the background triplet state levels in DCBr were also observed for the first time and this confirms the signlet-triplet energy gap to be 2061 cm-1 (5.89 kcal/mol) in DCBr. Emission spectra following the 266nm multiphoton photolysis of bromoform (CHBr3/CDBr3) were successfully obtained in a supersonic free jet expansion with an ICCD detector. The emission bands of Br, Br2, CH, and C2 were observed. In comparison with the enthalpies of formation of these species, the mechanism of 266nm multiphoton photolysis of bromoform is predicted.
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