Plasma-screening effects on the electron-impact excitation of hydrogenic ions in dense plasmas
- 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), Vol. 5:9; ISSN 0899-8221
- Country of Publication:
- United States
- Language:
- English
Similar Records
Screening modification on the trajectory of the projectile electron in the electron--ion excitation in dense plasmas
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
Related Subjects
HYDROGEN IONS
CROSS SECTIONS
ELECTRON-ION COLLISIONS
EXCITATION
EXCITED STATES
GROUND STATES
RITZ METHOD
WAVE FUNCTIONS
CALCULATION METHODS
CHARGED PARTICLES
COLLISIONS
ELECTRON COLLISIONS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
FUNCTIONS
ION COLLISIONS
IONS
700380* - Elementary & Classical Processes in Plasmas- (1992-)