title: A3Pi1u<--X1Sigmag+ laser photoacoustic spectroscopy of Br2 vapor in the extreme red wavelength region 665-720 nm.
abstract: The A3Pi1u<--X1Sigmag+ photoacoustic spectrum of Br2 vapor has been studied and vibronic analysis performed using earlier data available for this system of bands from optical spectroscopy in the region 665-720 nm. The vibronic levels involved in these transitions are 4< or =v'< or =21 and 1< or =v''< or =4. The relative photoacoustic intensities of the vibronic bands have been used in estimating the non-radiative relaxation rate from vibrational levels of A3Pi(1u) state. The non-radiative relaxation is found to be a nonlinear function of the upper state vibrational quantum number. The radiative rate constants for the A3Pi(1u) state vibrational levels have been compared with the corresponding non-radiative constants obtained from present work. Non-radiative decay rate constants for the vibrational levels of A3Pi(1u) state have been experimentally determined for the first time from photoacoustic spectrum of Br2 vapor in the extreme red region.
authors.affiliation: Department of Chemistry, Institute of Atomic and Molecular Sciences, National Taiwan University, Academia Sinica, Taipei 106, Taiwan, ROC. sharma@hp9k720.iams.sinica.edu.tw
authors.forename: Ramesh C
authors.initials: RC
authors.lastname: Sharma
authors.forename: S N
authors.initials: SN
authors.lastname: Thakur
authors.forename: K C
authors.initials: KC
authors.lastname: Lin
mesh_terms: D000162:Acoustics; D001966:Bromine / Q000737:chemistry*; D007834:Lasers; D010777:Photochemistry; D013053:Spectrophotometry / Q000295:instrumentation / Q000379:methods*; D014835:Volatilization
chemical_list: D001966:Bromine