Anisotropy of excited He/sup +/ formed in the photoionization of helium
Semianalytic methods are developed to predict the alignment and orientation of excited helium ions produced in the photoionization of neutral helium in the low-energy limit. The ionic electron probability distribution is shown to align itself orthogonal to the direction of the incident light polarization axis in the same manner as the photoelectron angular distribution (C.H. Greene, Phys. Rev. Lett. 44, 869 (1980)). In certain instances, propensity rules for the alignment and orientation of the ionic electron are violated. Coherent contributions from different degenerate orbital angular momenta are seen to be partially responsible for these ''unfavored'' trends. Explicit predictions of the time-unresolved fluorescence polarization are presented, including the effects of fine-structure depolarization.
- Research Organization:
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803
- OSTI ID:
- 6795004
- Journal Information:
- Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 39:1; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ANISOTROPY
BEAMS
DIPOLE MOMENTS
ELECTRIC DIPOLE MOMENTS
ELECTRIC MOMENTS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
FLUORESCENCE
GASES
HELIUM
IONIZATION
LUMINESCENCE
NONMETALS
ORIENTATION
PHOTOIONIZATION
POLARIZED BEAMS
RARE GASES