Differential cross sections for the electron-impact excitation of He-like ions: 2 sup 1 S and 2 sup 1 P states

Journal Article · Sun Oct 01 04:00:00 EDT 1989 · Physical Review (Section) A: General Physics; (USA)

DOI:https://doi.org/10.1103/PhysRevA.40.3646· OSTI ID:5401002

Sakimoto, K; Itikawa, Y ^[1]

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1. Institute of Space and Astronautical Science, Yoshinodai, Sagamihara 229, Japan (JP)

Differential cross sections for the electron-impact excitation of ions are calculated and compared along the He-like isoelectronic sequence. A distorted-wave method is used to obtain the cross sections for the transitions 1 {sup 1}S{r arrow}2 {sup 1}S or 2 {sup 1}P in Li{sup +}, O{sup 6+}, and Si{sup 12+}. To complete the systematic study, a comparison is also made to the cross sections for neutral He and in the limit {ital Z}{r arrow}{infinity} ({ital Z} being the nuclear charge). Dependence on the collision energy and comparisons to the cross sections obtained by other methods are discussed in detail. For the 2 {sup 1}P excitation, an apparent generalized oscillator strength is derived for the ions using the present differential cross section. Their behavior is very different from the corresponding values of He.

• OSTI ID: 5401002
• Journal Information: Physical Review (Section) A: General Physics; (USA), Journal Name: Physical Review (Section) A: General Physics; (USA) Vol. 40:7; ISSN PLRAA; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTORTED WAVE THEORY
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUIDS
GASES
HELIUM
ION COLLISIONS
IONS
ISOELECTRONIC ATOMS
LITHIUM IONS
NONMETALS
OSCILLATOR STRENGTHS
OXYGEN IONS
P STATES
RARE GASES
S STATES
SILICON IONS