Effect of core-valence electron correlation in low-energy electron scattering with Ca atoms
- Department of Physics, Kansas State University, Manhattan, Kansas 66506 (United States)
- Department of Applied Physics, National University of Defense Technology, Changsha 410073, Peoples Republic of (China)
R-matrix calculations have been carried out to investigate the effect of core-valence electron correlation on the scattering of electrons with Ca atoms at low energies. While the major feature of the d-wave shape resonance with a peak near 1.3 eV in the total cross section can be reproduced by including only the correlation among the valence electrons, we show that the existence of a low-energy peak near 0.15 eV, which has also been observed experimentally, can be obtained only if the correlations between the valence and core electrons are considered. This low-energy peak is shown not caused by a shape resonance, but rather due to the rapid decrease of the s- and p-wave phase shifts with collision energies. The present result also indirectly supports the previous conclusion that core-valence electron correlation is responsible for bringing the electron affinity of Ca{sup {minus}} from 72 to 15 meV, i.e., to a value which is much closer to the experiment. thinsp {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 664878
- Journal Information:
- Physical Review A, Vol. 58, Issue 4; Other Information: PBD: Oct 1998
- Country of Publication:
- United States
- Language:
- English
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