Excitation of alkali-metal-like ions by electron impact

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.47.2031· OSTI ID:6941455

Hervieux, P A; Guet, C ^[1]

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1. Departement de Recherche Fondamentale Matiere Condensee, LI2A, Centre d'Etudes Nucleaires de Grenoble, 85X, 38041 Grenoble CEDEX (France)

Differential and total cross sections for the dipole excitation of valence electrons in alkali-metal-like ions by electron impact well above the threshold energy are calculated in the generalized Born approximation and in a semiclassical approximation. The angular distribution is peaked at an angle which is essentially defined by energy-momentum-matching conditions on the classical Coulomb trajectory; around this angle, the semiclassical description is in excellent agreement with the quantal description. Deviations from the mean-field electron screening are weak and manifest themselves only in backward scattering. Semiclassical total cross sections are practically equal to the Coulomb-Born predictions. This near equality is explained within the WKB approximation. The practical equivalence between the semiclassical, WKB, and Coulomb-Born approximations applies also for other multipoles in a wide range, of energy transfer, and ionic charge.

• OSTI ID: 6941455
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 47:3; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
BASIC INTERACTIONS
BORN APPROXIMATION
CHARGED PARTICLES
COLLISIONS
COULOMB SCATTERING
CROSS SECTIONS
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITATION
INTERACTIONS
ION COLLISIONS
IONS
MULTICHARGED IONS
SCATTERING
SCREENING
SEMICLASSICAL APPROXIMATION