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Visible Wavelength Electronic Spectroscopy of the DCBr ÖX̃ Vibronic Transition

✍ Scribed by Chun-Wei Chen; Tsung-Chuan Tsai; Bor-Chen Chang

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
94 KB
Volume
209
Category
Article
ISSN
0022-2852

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✦ Synopsis

The laser excitation and dispersed fluorescence spectra of the DCBr Ã-X vibronic bands between 570 and 600 nm were successfully obtained in a direct current (DC) discharge supersonic free jet expansion. The analysis of the dispersed fluorescence spectra results in information on the vibrational structure of the DCBr X 1 A state for the first time. Perturbations due to the background levels of the ã3 A state can be recognized. The data are consistent with the previously reported triplet-singlet energy gap (the zero-point level energy gap) of 5.73 ± 0.02 kcal/mol for HCBr. We have determined the vibrational frequencies to be 832 cm -1 (bend) and 663 cm -1 (C-Br stretch) for the X 1 A state. In addition to the X state vibrational structure, the Ã(0,6,2) and Ã(0,5,0) levels were also observed for the first time.

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