Plasma-screening effects on the electron-impact excitation of hydrogenic ions in dense plasmas

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860636· OSTI ID:6021484

Jung, Y ^[1]

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1. Space Science Laboratory, ES-65, NASA/Marshall Space Flight Center, Huntsville, Alabama 35812 (United States)

Plasma-screening effects are investigated on electron-impact excitation of hydrogenic ions in dense plasmas. Scaled cross sections [ital Z][sup 4][center dot][sigma] for 1[ital s][r arrow]2[ital s] and 1[ital s][r arrow]2[ital p] are obtained for a Debye--Hueckel model of the screened Coulomb interaction. Ground and excited bound wave functions are modified in the screened Coulomb potential (Debye--Hueckel model) using the Ritz variation method. The resulting atomic wave functions and their eigenenergies agree well with the numerical and high-order perturbation theory calculations for the interesting domain of the Debye length [Lambda]/[ital a][sub [ital Z]][ge]10. The Born approximation is used to describe the continuum states of the projectile electron. Plasma screening effects on the atomic electrons cannot be neglected in the high-density cases. Including these effects, the cross sections are appreciably increased for 1[ital s][r arrow]2[ital s] transitions and decreased for 1[ital s][r arrow]2[ital p] transitions.

• OSTI ID: 6021484
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 5:9; ISSN 0899-8221; ISSN PFBPEI
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700380* -- Elementary & Classical Processes in Plasmas-- (1992-)
CALCULATION METHODS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FUNCTIONS
GROUND STATES
HYDROGEN IONS
ION COLLISIONS
IONS
RITZ METHOD
WAVE FUNCTIONS