Excitation transfer reactions in neon afterglows at 150/sup 0/K, 300/sup 0/K and 400/sup 0/K
The results of an experimental study of excitation transfer reactions in the afterglow period of pulsed discharges in pure neon are presented. The temporal decay of excited atom populations were monitored using the technique of resonance absorption, and absolute excited state populations were determined for the lowest lying manifold of excited states (/sup 3/P/sub 2/, /sup 3/P/sub 1/, /sup 3/P/sub 0/, /sup 1/P/sub 1/). The density range 5 x 10/sup 17/ - 10/sup 19/ cm/sup -3/ was examined and rate data determined at operating temperatures of 150/sup 0/K, 300/sup 0/K and 400/sup 0/K through analysis of the individual excited state decay profiles. In agreement with results of previous experimental studies, collisions with ground state neon atoms were found to play the dominant role in quenching individual excited state populations. A matrix of rate constants for neutral induced two-body mixing between the triplet states and three-body quenching of the excited states were determined at each of the operating temperatures. Additionally, rate data was determined for two-body processes involving electrons and for the decay of imprisoned radiation of the resonant state /sup 3/P/sub 1/. The temperature dependences of the measured rate coefficients indicate a need for refinement of the theoretical potential curves presently available. For example, the temperature variation of both the two-body and three-body rate coefficients for the /sup 3/P/sub 2/ state warrant a less repulsive long-range potential for the potential curves than currently allowed. Additionally, the large two-body rates found for the /sup 3/P/sub 0/ state suggest the need for addiational coupling mechanisms in the theoretical calculations of mixing rate constants.
- Research Organization:
- Texas Univ., Dallas (USA)
- OSTI ID:
- 6114571
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
AFTERGLOW
ATOMS
COLLISIONS
DATA
DIRECT REACTIONS
ELECTRIC DISCHARGES
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
EXPERIMENTAL DATA
FLUIDS
GASES
INFORMATION
LOW TEMPERATURE
MEDIUM TEMPERATURE
NEON
NONMETALS
NUCLEAR REACTIONS
NUMERICAL DATA
QUENCHING
RARE GASES
TEMPERATURE DEPENDENCE
TRANSFER REACTIONS