Quantum-resolved vibrational energy transfer in Br{sub 2} B{sup 3}{Pi}(O{sub u}{sup +})
- Air Force Inst. of Technology, Wright-Patterson AFB, OH (United States). Dept. of Engineering Physics
Collisional energy transfer processes in the diatomic halogens and interhalogens have been studied extensively. The studies of vibrational and rotational energy transfer in the B{sup 3}{Pi}(O{sup +}) states of BrF, BrCl, and more recently Br{sub 2}, are motivated by the desire to develop a visible chemical laser. State-to-state vibrational energy transfer and electronic quenching in the lower vibrational levels, v{prime} {<=} 3, of the B{sup 3}{Pi}(O{sub u}{sup +}) state of {sup 79}Br{sub 2} were investigated using spectrally resolved, temporally resolved laser induced fluorescence techniques. Spectrally resolved emissions from collisionally populated Br{sub 2}(B) vibrational levels were observed for Br2 and rare gas collision partners. Vibrational transfer is quite efficient in the non-predissociated levels and is adequately described by the Montroll-Shuler model for harmonic oscillators. A fundamental rate coefficient for vibrational transfer from v{prime}=1 to v{prime}=0, k{sub v}(1,0), was used to characterize vibrational relaxation. For Br{sub 2} collisions, the rate coefficient was k{sub v}(1,0) = 3.6 {+-} 0.4 {times} 10{sup {minus}11} cm{sup 3}/molecules. The rate coefficients for the rare gases were slightly slower, ranging from 2.5 {+-} 0.3 {times} 10{sup {minus}11} cm{sup 3}/molecule-s for helium to 3.1 {+-} 0.4 {times} 10{sup {minus}11} cm{sup 3}/molecule-s for xenon.
- OSTI ID:
- 28075
- Report Number(s):
- CONF-940142-; ISBN 0-8194-1417-4; TRN: IM9516%%201
- Resource Relation:
- Conference: OE/LASE `94: conference on optics, electro-optics, and laser applications in science and engineering, Los Angeles, CA (United States), 22-29 Jan 1994; Other Information: PBD: 1994; Related Information: Is Part Of Laser techniques for state-selected and state-to-state chemistry II. Proceedings: SPIE Volume 2124; Hepburn, J.W. [ed.]; PB: 435 p.
- Country of Publication:
- United States
- Language:
- English
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