Two-electron excitation in slow ion-atom collisions: Excitation mechanisms and interferences among autoionizing states

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

OSTI ID:6234019

Kimura, M ^[1]

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1. Argonne National Lab., IL (USA) Rice Univ., Houston, TX (USA). Dept. of Physics

The two-electron capture or excitation process resulting from collisions of H{sup +} and O{sup 6+} ions with He atoms in the energy range from 0.5 keV/amu to 5 keV/amu is studied within a molecular representation. The collision dynamics for formation of doubly excited O{sup 4+} ions and He** atoms and their (n{ell}, n{prime}{ell}{prime}) populations are analyzed in conjunction with electron correlations. Autoionizing states thus formed decay through the Auger process. An experimental study of an ejected electron energy spectrum shows ample structures in addition to two characteristic peaks that are identified by atomic and molecular autoionizations. These structures are attributable to various interferences among electronic states and trajectories. We examine the dominant sources of the interferences. 12 refs., 5 figs.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6234019
• Report Number(s): CONF-9009294-1; ON: DE91004474; TRN: 90-036208
• Resource Relation: Conference: 15. international symposium on the physics of ionized gases (SPIG '90), Dubrovnik (Yugoslavia), 3-7 Sep 1990
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
HELIUM
ION-ATOM COLLISIONS
EXCITATION
OXYGEN IONS
AUTOIONIZATION
CAPTURE
ELECTRON CORRELATION
HAMILTONIANS
HYDROGEN IONS 1 PLUS
MULTICHARGED IONS
TRAJECTORIES
WAVE FUNCTIONS
ATOM COLLISIONS
CATIONS
CHARGED PARTICLES
COLLISIONS
CORRELATIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
FLUIDS
FUNCTIONS
GASES
HYDROGEN IONS
ION COLLISIONS
IONIZATION
IONS
MATHEMATICAL OPERATORS
NONMETALS
QUANTUM OPERATORS
RARE GASES
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena
640302 - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory