Ratio of double-to-single ionization of He by N sup 7+ projectiles

Journal Article · Sat Feb 01 00:00:00 EST 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.45.2083· OSTI ID:7276797

Deb, N C ^[1]; Crothers, D S.F.; Dunseath, K M ^[2]; Bhattacharjee, B ^[3]

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1. Department of Theoretical Physics, Indian Association for the Cultivation of Science, Jadavpur, Calcutta 700 032 (India)
2. Department of Applied Mathematics and Theoretical Physics, The Queen's University of Belfast, Belfast BT7 1NN (Northern Ireland)
3. Department of Mathematics, Prafulla Chandra College, 23/49 Gariahat Road, Calcutta 700 029 (India)

We apply the continuum-distorted-wave approximation within the framework of the independent-event model to calculate the ratio ({ital R}) of double-to-single ionization cross sections of He by N{sup 7+} projectiles. Following Deb and Crothers (J. Phys. B 23, L7999 (1990)), we calculate the double-ionization probability as {ital P}{sub 1}{ital P2}, whereas the single-ionization probability is taken to be 2{ital P}{sub 1}(1{minus}{ital P}{sub 1}). Here, {ital P}{sub {ital i}} ({ital i}=1,2) is the probability of ionizing the {ital i}th electron from He. The values of {ital R} found in the 10--40-MeV/u impact-energy range are similar to those obtained in the somewhat different forced-impulse theory of Reading and Ford (Phys. Rev. Lett. 58, 543 (1987)) and by the semiempirical fit of Knudsen {ital et} {ital al}. (J. Phys. B 17, 3545 (1984)), but are much smaller in absolute value than the corresponding measurements of Heber {ital et} {ital al}. (Phys. Rev. Lett. 64, 851 (1990); Nucl. Instrum. Methods B 56/57, 15 (1991)).

• OSTI ID: 7276797
• Journal Information: Physical Review A. General Physics; (United States), Vol. 45:3; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
HELIUM
ION-ATOM COLLISIONS
NITROGEN IONS
CROSS SECTIONS
DISTORTED WAVE THEORY
EIKONAL APPROXIMATION
ELECTRON CORRELATION
EXCITED STATES
IONIZATION
TRANSITION AMPLITUDES
WAVE FUNCTIONS
AMPLITUDES
ATOM COLLISIONS
CHARGED PARTICLES
COLLISIONS
CORRELATIONS
ELEMENTS
ENERGY LEVELS
FLUIDS
FUNCTIONS
GASES
ION COLLISIONS
IONS
NONMETALS
RARE GASES
664300* - Atomic & Molecular Physics- Collision Phenomena- (1992-)