Bimolecular and ''three-body'' quenching of Paschen-1s argon atoms by N/sub 2/, H/sub 2/, and O/sub 2/ and effects of N/sub 2/ on the yield of the first triplet argon excimer
Rate constants for bimolecular quenching of Ar (1s) resonance-state and metastable atoms by N/sub 2/, H/sub 2/, and O/sub 2/ have been measured by fast absoprtion spectrophotometry at argon pressures in the 10/sup 2/--10/sup 3/ Torr region at 298 K. ''Three-body'' quenching attributed to collisional relaxation of vibrationally excited dissociative excimer molecules by molecular quenching agents has been observed to occur efficiently for all Ar (1s) atoms in the presence of H/sub 2/ and O/sub 2/, but only for the resonance-state Ar (1s) species in the presence of N/sub 2/. A discussion and analysis of the temporal behavior and the yield of Ar/sub 2/ (/sup 3/..sigma../sup +//sub u/) molecules in the context of the mechanism for Ar (1s) atom decay and excimer formation indicates that the predominant precursors of the first triplet argon excimer in Ar/N/sub 2/ mixtures are probably Ar (/sup 3/P/sub 2/) atoms and Ar/sub 2/ van der Waals molecules, the latter through the agency of N/sub 2/ (C /sup 3/Pi/sub u/) at higher N/sub 2/ concentrations.
- Research Organization:
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
- OSTI ID:
- 6790548
- Journal Information:
- J. Chem. Phys.; (United States), Vol. 74:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ARGON
ATOM-MOLECULE COLLISIONS
DE-EXCITATION
HYDROGEN
NITROGEN
OXYGEN
ABSORPTION SPECTROSCOPY
KINETICS
METASTABLE STATES
MOLECULES
S STATES
THREE-BODY PROBLEM
ATOM COLLISIONS
COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUIDS
GASES
MANY-BODY PROBLEM
MOLECULE COLLISIONS
NONMETALS
RARE GASES
SPECTROSCOPY
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena