Two-center effects in electron emission in sup 3 He sup 2 + -He and H sup + -He collisions at intermediate energies
- Comision Nacional de Energia Atomica, Centro Atomico Bariloche, 8400 San Carlos de Bariloche, Argentina (AR)
We present measurements of doubly differential cross sections (DDCS) with respect to energy and angle for electron emission produced when 100- and 50-keV/u {sup 3}He{sup 2+} and H{sup +} collide with He. An electron spectrometer designed for this purpose enables us to measure electron distributions which, even at small emission angles, do not present appreciable deformations of the measured distributions by extended gas target effects. Using the ratio of the emissions obtained with {sup 3}He{sup 2+} and H{sup +}, we study the dependence of the DDCS on the projectile charge. We confirm a saturation of this emission ratio that increases with increasing angle. Furthermore, we report a sudden enhancement of the emission ratio that is found at and above the electron capture to the continuum peak. These observations are in basic but not quantitative agreement with calculations performed using a model that incorporates the continuum distorted wave and eikonal initial state and that approximately accounts for a two-center interaction of the active electron.
- OSTI ID:
- 7163629
- Journal Information:
- Physical Review (Section) A: General Physics; (USA), Journal Name: Physical Review (Section) A: General Physics; (USA) Vol. 40:12; ISSN PLRAA; ISSN 0556-2791
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ATOM COLLISIONS
CATIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELECTRON EMISSION
ELEMENTS
EMISSION
ENERGY RANGE
ENERGY SPECTRA
EXPERIMENTAL DATA
FLUIDS
GASES
HELIUM
HELIUM IONS
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
INFORMATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 10-100
KEV RANGE 100-1000
NONMETALS
NUMERICAL DATA
RARE GASES
SPECTRA