Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
89 (1988), S. 1358-1363
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
This is a study of the deexcitation mechanisms of the metastable 5 2D3/2 state of Ba+ in about 1 atm He buffer gas in the temperature range of 500–650 °C. The ions were produced by three-photon ionization with light tuned to a resonance between two excited states of Ba, enabling the electron density to be varied independently of the temperature and pressure. The deexcitation is dominated by superelastic scattering of electrons with a cross section of σse =45±20 A(ring)2 (corresponding to an electron-impact excitation cross section of 11 A(ring)2) and quenching by Ba atoms with a cross section of σBa =130±25 A(ring)2. No dependence of the deexcitation rate on He density was detected, and we infer an upper limit on the cross section of σHe ≤9×10−22 cm2.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.455187
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