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Emission-line profiles of helium autoionization states after excitation by fast Li and He ions

Journal Article · · Phys. Rev. A; (United States)
;

We report the angle-dependent electron emission from the (2s/sup 2/) /sup 1/S, (2s2p) /sup 1/P, and (2p/sup 2/) /sup 1/D autoionizing states of helium, after excitation by 100-keV/amu Li/sup +/, Li/sup 2+/, and 500-keV/amu He/sup +/, He/sup 2+/, Li/sup +/, Li/sup 2+/, and Li/sup 3+/ ions. All of the peak profiles are strongly affected by the electron-ion interaction that occurs after ionization. A method that accounts for this post-collision interaction, and allows comparison with theoretical calculations, is presented, and some previously unexplained discrepancies between theoretical and experimental line profiles are resolved. The differently charged ions cause systematic changes in the observed line profiles. We report some projectile-charge-dependent emission intensities for the different peaks. Accurate energy differences between the excited states are reported.

Research Organization:
Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
OSTI ID:
6015863
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 36:7; ISSN PLRAA
Country of Publication:
United States
Language:
English

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Related Subjects

640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
AUTOIONIZATION
CHARGED PARTICLES
COLLISIONS
ELECTRON EMISSION
ELEMENTS
EMISSION
ENERGY LEVELS
ENERGY RANGE
FLUIDS
GASES
HELIUM
HELIUM IONS
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
KEV RANGE
KEV RANGE 100-1000
LEVEL WIDTHS
LITHIUM IONS
MEV RANGE
MEV RANGE 01-10
NONMETALS
RARE GASES