Angular distribution of [delta] electrons emitted in collisions of 1. 0-MeV/u F[sup [ital q]+] ([ital q]=4,6,8,9) with molecular hydrogen

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.50.1328· OSTI ID:7014723

Liao, C; Richard, P; Grabbe, S R; Bhalla, C P; Zouros, T J.M.; Hagmann, S ^[1]

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1. J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506-2604 (United States)

The angular distribution, as well as the energy distribution of [delta] electrons produced in collisions of 1.0-MeV/u F[sup [ital q]+] ([ital q]=4,6,8,9) ions with molecular hydrogen, have been studied for laboratory observation angles ([theta][sub [ital L]]) from 0[degree] to 70[degree] with respect to the beam direction. The measurements are in fair agreement with the impulse approximation calculations which use the quantal elastic electron-ion differential scattering cross sections folded with the Compton profile of the target electrons. We observe that the energy of the centroid of the binary-encounter-electron (BEE) peak is projectile charge state, [ital q], and laboratory angle, [theta][sub [ital L]], dependent. Moreover, at 0[degree], an enhancement of the ratio of the observed double differential cross section for nonbare projectiles to that for the bare ion projectiles, [sigma]([ital q]+)/[sigma](9+), is observed, contrary to the [ital q][sup 2] scaling predicted by a first Born calculation for ionization. This ratio [sigma]([ital q]+)/[sigma](9+) decreases nonotonically with increasing [theta][sub [ital L]], and becomes smaller than one for [theta][sub [ital L]][ge]30[degree].

• OSTI ID: 7014723
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 50:2; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ATOM COLLISIONS
BINARY ENCOUNTER METHOD
CALCULATION METHODS
CHARGED PARTICLES
COLLISIONS
COMPARATIVE EVALUATIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELECTRON EMISSION
ELEMENTS
EMISSION
ENERGY RANGE
ENERGY SPECTRA
EVALUATION
FLUORINE IONS
HYDROGEN
IMPULSE APPROXIMATION
INFORMATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
MEV RANGE
MEV RANGE 01-10
MULTICHARGED IONS
NONMETALS
NUMERICAL DATA
PARAMETRIC ANALYSIS
SPECTRA
THEORETICAL DATA