Temperature dependence of electronic to vibrational energy transfer from Br(4/sup 2/P/sub 1/2/) to /sup 12/CO/sub 2/ and /sup 13/CO/sub 2/

Journal Article · Sun Oct 15 00:00:00 EDT 1978 · J. Chem. Phys.; (United States)

OSTI ID:6687308

Reisler, H; Wittig, C

Temperature dependent quenching cross sections for the collisional deactivation of Br(4/sup 2/P/sub 1/2/) by /sup 12/CO/sub 2/ and /sup 13/CO/sub 2/ were determined by monitoring the time resolved molecular fluorescence from the ..nu../sub 3/ vibrational mode of CO/sub 2/. These cross sections decrease with increasing temperature in the range 296--600 /sup 0/K, indicating that near resonant channels dominate the quenching processes in both molecules. The room temperature rate coefficients for the quenching of Br* by /sup 12/CO/sub 2/ and /sup 13/CO/sub 2/ are (5.0 +- 0.2)10/sup 5/ and (2.3 +- 0.1)10/sup 5/ sec/sup -1/ torr/sup -1/, respectively, with about half of the quenching collisions resulting in excitation of the ..nu../sub 3/ mode in the case of each molecule. By monitoring the amplitudes of the ..nu../sub 3/ fluorescence signals from /sup 13/CO/sub 2/ at different temperatures, the temperature dependence of the electronic to vibrational (E..-->..V) energy transfer cross sections into states containing ..nu../sub 3/ excitation was obtained. The experimental results are compared with calculations of E..-->..V energy transfer cross sections which are based on long-range multipolar interactions.

• Research Organization: Departments of Electrical Engineering and Physics, University of Southern California, University Park, Los Angeles, California 90007
• OSTI ID: 6687308
• Journal Information: J. Chem. Phys.; (United States), Vol. 69:8
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BROMINE
ATOM-MOLECULE COLLISIONS
CARBON DIOXIDE
CROSS SECTIONS
ENERGY TRANSFER
EXCITATION
FLUORESCENCE
VIBRATIONAL STATES
ATOM COLLISIONS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
HALOGENS
LUMINESCENCE
MOLECULE COLLISIONS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena