Plasma-screening effects on direct 1{ital s}{r_arrow}2{ital p}{sub {plus_minus}} electron{endash}ion collisional excitation rates in dense plasmas
- Department of Physics, Catholic University of Taegu-Hyosung, Kyungbuk, Hayang 713-702, South (Korea)
- Department of Physics, Hanyang University, Ansan, Kyunggi-Do 425-791, South (Korea)
Plasma-screening effects are investigated on the 1{ital s}{r_arrow}2{ital p}{sub {minus}} ({ital m}={minus}1) and 1{ital s}{r_arrow}2{ital p}{sub +} ({ital m}=+1) electron{endash}ion collisional excitation rates in dense plasmas. The excitation rates are calculated using the semiclassical excitation cross sections obtained by the classical straight-line trajectory approximation with the nonspherical Debye{endash}H{umlt u}ckel potential. The results show that the ratio of the 1{ital s}{r_arrow}2{ital p}{sub +} to 1{ital s}{r_arrow}2{ital p}{sub {minus}} excitation rates is found to be a slowly varying function of the temperature. Including the plasma-screening effects for hydrogenic ions, the ratio is found to be a monotonically increasing function of the parameter ({ital Z}{sup 2}{ital Ry}/{ital kT}){sup 1/2}. However, without the plasma-screening effects, the ratio becomes a monotonically decreasing function. The plasma-screening effects appreciably enhance the 1{ital s}{r_arrow}2{ital p}{sub {minus}} excitation rates and reduce the 1{ital s}{r_arrow}2{ital p}{sub +} excitation rates. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 284307
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 3; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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