Laser studies of electronic excitation transfer in atomic calcium: Ca(4s5p /sup 1/P/sub 1/)+Ararrow-right-leftCa(4s5p /sup 3/P/sub 2,1,0/)+Ar
Time-resolved nsec kinetic methods are used to measure state specific electronic excitation transfer for the near-resonant process: Ca(4s5p /sup 1/P/sub 1/) +Ar /sup k//sub 1/arrow-right-left/sub k//sub -/1 Ca(4s5p /sup 3/P/sub 2,1,0/)+Ar. In stimulated emission experiments it is found that the Ca(4s5p /sup 3/P/sub 2/) level is preferentially populated. The rate constant k/sub 1/ for the specific /sup 3/P/sub 2/ channel is 5.2 +- 0.5 x 10/sup -11/ cm/sup 3/ molecule/sup -1/ sec/sup -1/. These results are discussed in terms of near-resonant spin changing collision mechanisms. Radiative lifetimes for Ca(4s5p /sup 1/P/sub 1/) and Ca(4s5p /sup 3/P/sub 1/) are also determined to be 77 +- 2 nsec and 67 +- 2 nsec, respectively.
- Research Organization:
- Joint Institute for Laboratory Astrophysics, National Bureau of Standards
- OSTI ID:
- 6774805
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 74:10; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420300* -- Engineering-- Lasers-- (-1989)
ALKALINE EARTH METALS
ARGON
ATOM COLLISIONS
ATOM-ATOM COLLISIONS
CALCIUM
COLLISIONS
ELECTRONIC STRUCTURE
ELEMENTS
EMISSION
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUIDS
GAS LASERS
GASES
KINETICS
LASERS
METALS
NONMETALS
RARE GASES
STIMULATED EMISSION