Quasi-coincidence measurement of the polarization of radiation emitted from the 3/sup 3/P state of fast helium atoms populated by He/sup +/-He charge transfer collisions
The circular and linear polarizations of photons emitted in the 2/sup 3/S-3/sup 3/P Hel transition have been measured. The 3/sup 3/P state of fast helium atoms was populated by He/sup +/-He charge transfer collisions in the incident ion energy range from 2.5 to 4.0 keV. Radiation from the fast atoms was collected as a function of scattering angle by selecting scattered atoms with an angle-defining aperture. Comparison of the measured values of the Stokes parameters M/I and C/I with linear polarization data from true coincidence measurements enabled checks on possible systematic errors, as well as assessments of the effects of limited angular resolution and stray magnetic fields. Corrections for the cascading from higher levels based on related measurements were estimated. Measurement of the Stokes parameter S/I permitted a direct comparison with theoretical predictions of the magnitude of this parameter. Although limited in precision by uncertainties in several quantities associated with the analysis, the data appear to be in basic agreement with the predictions of this theory. These measurements provide useful information on the quasicoincidence measurement method as applied to both ion-atom and ion-surface charge transfer coherence studies.
- Research Organization:
- Texas A and M Univ., College Station (USA)
- OSTI ID:
- 6350988
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HELIUM
ENERGY-LEVEL TRANSITIONS
ION-ATOM COLLISIONS
HELIUM IONS
ANGULAR DISTRIBUTION
CHARGE EXCHANGE
EXPERIMENTAL DATA
KEV RANGE 01-10
POLARIZATION
STOKES PARAMETERS
ATOM COLLISIONS
CHARGED PARTICLES
COLLISIONS
DATA
DISTRIBUTION
ELEMENTS
ENERGY RANGE
FLUIDS
GASES
INFORMATION
ION COLLISIONS
IONS
KEV RANGE
NONMETALS
NUMERICAL DATA
RARE GASES
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory
640304 - Atomic
Molecular & Chemical Physics- Collision Phenomena