Spectroscopic and Vibrational Energy Transfer Studies in Molecular Bromine
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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Vibrational transfer and electronic quenching in the lower vibrational levels vless than or equal 3 of the B3piOu state of 79Br2 were investigated using spectrally resolved, temporally resolved laser induced fluorescence techniques. Spectrally resolved emissions from collisionally populated Br2B vibrational levels were observed for Br2 and rare gas collision partners. Vibrational transfer was efficient in the non-predissociative vibrational levels and was adequately described by the Montroll-Shuler model for harmonic oscillators. A single fundamental rate coefficient for vibrational transfer from v 1 to v 0, kv1,0, characterizes vibrational relaxation. For Br2, the value was kv1,0 3.6 or - 0.4 x 10 exp-11 cu cmmolec.sec. For rare gas collisions, values ranged from kv1,0 2.5 or - 0.3 x 10 exp-11 cu cmmolec.sec for helium to kv1,0 3.1 - 0.4 x 10 exp-11 cu cmmolec.sec for xenon. Electronic quenching rates for the observed vibrational levels were obtained from the same data. For Br2, the quenching rate coefficient was kq 3. 7 or - 1.2 x 10 exp-11 cu cmmolec.sec. Quenching rate coefficients for the rare gases were smaller, kq 8.0 or - 1.2 x 10 exp-12 cu cmmolec.sec.
- Radiation and Nuclear Chemistry
- Fabrication Metallurgy
- Atomic and Molecular Physics and Spectroscopy