Nascent rovibrational distribution of O+2(A 2Pi/sub u/) produced by He(2 3S) Penning ionization of O2
- 1. Institute of Advanced Material Study and Department of Molecular Science and Technology, Graduate School of Engineering Sciences, Kyushu University, Kasuga-shi, Fukuoka, 816 Japan
Description
The He(2 3S) Penning ionization of O2 to give O+2(A 2Pi/sub u/) has been studied by observing the O+2(A 2Pi/sub u/--X 2Pi/sub g/) emission in beam and flowing afterglow apparatus. A comparison of beam and flowing afterglow data indicates that the nascent rovibrational distribution is lost in the flowing afterglow due to collisional relaxation. The nascent vibrational distribution of O+2(A 2Pi/sub u/) shifts to lower vibrational levels in comparison with the Franck--Condon factors for vertical O2(X)→O+2(A) ionization. The rotational temperature decreases from 4200 K for v' = 0 to 400 K for v' = 13. Vibrational relaxation of O+2(A) accompanied by a significant rotational excitation is explained as a result of a short-range repulsive interaction [He--O+2(A)→He+O+2(A)] in the exit channel
Additional details
Publishing Information
- Journal Title
- Journal of Chemical Physics
- Journal Volume
- 89
- Journal Issue
- 11
- Series
- J. Chem. Phys.
- Journal Page Range
- 6753-6757
- ISSN
- 0021-9606
- CODEN
- JCPSA
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 20013590
- Subject category
- S74: ATOMIC AND MOLECULAR PHYSICS;
- Descriptors DEI
- AFTERGLOW; ATOM-MOLECULE COLLISIONS; ATOMIC BEAMS; CHEMICAL REACTION YIELD; DISTRIBUTION; HELIUM; IONIZATION; METASTABLE STATES; OXYGEN; OXYGEN IONS; PENNING EFFECT; RELAXATION; ROTATIONAL STATES; VIBRATIONAL STATES
- Descriptors DEC
- ATOM COLLISIONS; BEAMS; CHARGED PARTICLES; COLLISIONS; ELEMENTS; ENERGY LEVELS; EXCITED STATES; IONS; MOLECULE COLLISIONS; NONMETALS; RARE GASES