Differential elastic and quenching cross sections for Ar*(3P) and CO2(X1 ∑g )
Titel:
Differential elastic and quenching cross sections for Ar*(3P) and CO2(X1 ∑g )
Auteur:
Fraites, James L. Winicur, Daniel H.
Verschenen in:
Molecular physics
Paginering:
Jaargang 35 (1978) nr. 4 pagina's 927-939
Jaar:
1978-04
Inhoud:
The energy dependence of the differential scattering of metastable Ar*(3P) by ground-state CO2(X1 ∑g+) has been studied at relative kinetic energies from 58 to 126 meV over an angular range of 5-160° c.m. using crossed molecular beams. The position and curvature of rainbow maxima, which are observed at each energy, are used to obtain parameters for a Lennard-Jones (12, 6) spherically symmetric potential. The position of the minimum, rm = 5·02 ± 0·65 Å, is identical to that for K + CO2 and the well depth, ε = 16·3 ± 0·8 meV, is about 10 per cent greater. The scattered intensity shows a distinct fall-off on the dark side of the rainbow compared to that expected for elastically scattered Ar*. This depletion, caused primarily by the quenching of Ar*, is analysed in terms of the optical-shadow model to determine the energy dependence of the observed quenching cross section, which is predicted to have a maximum of 67 Å2 at 193 meV.
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