2s Electron Loss to the Continuum from Metastable C⁴⁺ (1s2s, ³S) in C⁴⁺ Plus Helium Collisions

H. Aliabadi, P. Richard, C.P. Bhalla
J.R. Macdonald Laboratory, Kansas State University, Manhattan KS 66506

M. Gealy
Concordia College, Morehead, MN 56562

We have investigated the broad peak at 1200 eV in the electron production double differential cross section of 30 MeV C⁴⁺ collisions with a helium target at various laboratory scattering angles. In the present experiment this peak is observed at angles between 15° and 160°. A simple model treating the 2s electron of the metastable projectile as elastically scattering from the helium atom predicts an electron loss peak in the observed cross sections. The model which includes the Compton profile of the 2s electron in C⁴⁺ (1s2s, ³S) predicts the observed cross sections when the metastable fraction is taken into account. The data and comparisons with the model calculations will be presented.

This work was supported by the Chemical Sciences, Geosciences and Biosciences Division,
Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy.

Submitted to DAMOP/DAMP Meeting, May 2001 in London, Ontario.

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