TY - JOUR
T1 - Visible wavelength electronic spectroscopy of the DCBr Ã-X̃ vibronic transition
AU - Chen, Chun Wei
AU - Tsai, Tsung Chuan
AU - Chang, Bor Chen
N1 - Funding Information:
The authors are deeply grateful to Dr. Trevor Sears, Dr. James Muckerman, and Dr. Hua-Gen Yu (Brookhaven National Laboratory) for communicating results from unpublished work on the ab initio calculations of the DCBr vibrational energy levels. The support of this work by the National Science Council of Taiwan via Grant. NSC 89-2113-M-008-022 is gratefully acknowledged.
PY - 2001
Y1 - 2001
N2 - The laser excitation and dispersed fluorescence spectra of the DCBr Ã-X̃ 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 X̃1 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 X̃1 A′ state. In addition to the X̃ state vibrational structure, the Ã(0,6,2) and Ã(0,5,0) levels were also observed for the first time.
AB - The laser excitation and dispersed fluorescence spectra of the DCBr Ã-X̃ 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 X̃1 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 X̃1 A′ state. In addition to the X̃ state vibrational structure, the Ã(0,6,2) and Ã(0,5,0) levels were also observed for the first time.
KW - DCBr
KW - Direct current discharge
KW - Dispersed fluorescence
KW - Supersonic free jet expansion
KW - Triplet-singlet energy gap
KW - Vibrational structure
UR - http://www.scopus.com/inward/record.url?scp=0035743120&partnerID=8YFLogxK
U2 - 10.1006/jmsp.2001.8429
DO - 10.1006/jmsp.2001.8429
M3 - 期刊論文
AN - SCOPUS:0035743120
SN - 0022-2852
VL - 209
SP - 254
EP - 258
JO - Journal of molecular spectroscopy
JF - Journal of molecular spectroscopy
IS - 2
ER -