Angular distributions of single- and double-electron capture in very-slow Ar sup 6+ -Ar collisions

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6437489

Biedermann, C; Levin, J C; Short, R T; Elston, S B; Gibbons, J P; Kimura, K; Keller, N; Sellin, I A ^[1]; Cederquist, H; Andersson, L R; Andersson, H; Liljeby, L ^[2]

---

1. Tennessee Univ., Knoxville, TN (USA). Dept. of Physics Oak Ridge National Lab., TN (USA)
2. Manne Siegbahn Inst. of Physics, Stockholm (Sweden)

We have measured state-resolved angular distributions of one- and two-electron capture in 32 to 800 eV Ar{sup 6+} {minus} Ar collisions. The experimental energy-gain spectra show that single-electron capture mainly populates the 5s, 5p and 4f levels. We observe detailed structures in the corresponding angular distributions, but a final interpretation has to await a quantitative analysis of the collision dynamics. We tentatively ascribe the main features in the angular distribution of true double-electron capture at Q {approximately} 26 eV (4s4f and 4s5s) and Q {approximately} 42 eV (3d4d) to processes involving two consecutive one-electron transitions. For the transfer ionization process, we measure a Q-value of {approximately}eV, which we assign to autoionizing 4s5s (or 4s4f) levels. The 4s5s, 4s4f, and 3d4d levels all reside above the first ionization limit of Ar{sup 4+}, but we find that the 3d4d level stabilizes through radiative decay. 8 refs., 4 figs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE/ER; NSF; SENSRC
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6437489
• Report Number(s): CONF-901116-13; ON: DE91001217
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ARGON
ATOM COLLISIONS
AUTOIONIZATION
BEAM PROFILES
CAPTURE
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELECTRON CAPTURE
ELEMENTS
FLUIDS
GASES
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
MULTICHARGED IONS
NONMETALS
RARE GASES
SCATTERING