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Title: Angular distribution of low-energy electron emission in collisions of 6-MeV/u bare carbon ions with molecular hydrogen: Two-center mechanism and interference effect

Abstract

We report the energy and angular distribution of electron double differential cross sections (DDCS) in collision of 6-MeV/u C{sup 6+} ions with molecular hydrogen. We explain the observed distributions in terms of the two-center effect and the Young-type interference effect. The secondary electrons having energies between 1 and 1000 eV are detected at about 10 different emission angles between 30 degree sign and 150 degree sign . The measured data are compared with the state-of-the-art continuum distorted wave-eikonal initial state and the first Born model calculations which use molecular wave function. The single differential cross sections are derived and compared with the theoretical predictions. The oscillations due to the interference effect are derived in the DDCS ratios using theoretical cross sections for the atomic H target. The effect of the atomic parameters on the observed oscillations is discussed. An evidence of interference effect has also been shown in the single differential cross section. The electron energy dependence of the forward-backward asymmetry parameter shows a monotonically increasing behavior for an atomic target, such as He, which could be explained in terms of the two-center effect only. In contrast, for the molecular H{sub 2} the asymmetry parameter reveals an oscillatory behavior duemore » to the Young-type interference effect superimposed with the two-center effect. The asymmetry parameter technique provides a self-normalized method to reveal the interference oscillation which does not require either a theoretical model or complementary measurements on the atomic H target.« less

Authors:
; ; ; ; ; ;  [1];  [2]
  1. Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005 (India)
  2. (Argentina)
Publication Date:
OSTI Identifier:
20982530
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 75; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevA.75.052712; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ANGULAR DISTRIBUTION; ASYMMETRY; CARBON IONS; DIFFERENTIAL CROSS SECTIONS; DISTORTED WAVE THEORY; EIKONAL APPROXIMATION; ELECTRON EMISSION; ENERGY DEPENDENCE; ENERGY SPECTRA; EV RANGE; HYDROGEN; HYDROGEN 1 TARGET; INTERFERENCE; ION-MOLECULE COLLISIONS; IONIZATION; MEV RANGE 01-10; MOLECULES; OSCILLATIONS; WAVE FUNCTIONS

Citation Formats

Misra, Deepankar, Kelkar, A., Kadhane, U., Kumar, Ajay, Singh, Y. P., Tribedi, Lokesh C., Fainstein, P. D., and Centro Atomico Bariloche, Comision Nacional de Energia Atomica, Avenida E. Bustillo 9500, 8400 Bariloche. Angular distribution of low-energy electron emission in collisions of 6-MeV/u bare carbon ions with molecular hydrogen: Two-center mechanism and interference effect. United States: N. p., 2007. Web. doi:10.1103/PHYSREVA.75.052712.
Misra, Deepankar, Kelkar, A., Kadhane, U., Kumar, Ajay, Singh, Y. P., Tribedi, Lokesh C., Fainstein, P. D., & Centro Atomico Bariloche, Comision Nacional de Energia Atomica, Avenida E. Bustillo 9500, 8400 Bariloche. Angular distribution of low-energy electron emission in collisions of 6-MeV/u bare carbon ions with molecular hydrogen: Two-center mechanism and interference effect. United States. doi:10.1103/PHYSREVA.75.052712.
Misra, Deepankar, Kelkar, A., Kadhane, U., Kumar, Ajay, Singh, Y. P., Tribedi, Lokesh C., Fainstein, P. D., and Centro Atomico Bariloche, Comision Nacional de Energia Atomica, Avenida E. Bustillo 9500, 8400 Bariloche. Tue . "Angular distribution of low-energy electron emission in collisions of 6-MeV/u bare carbon ions with molecular hydrogen: Two-center mechanism and interference effect". United States. doi:10.1103/PHYSREVA.75.052712.
@article{osti_20982530,
title = {Angular distribution of low-energy electron emission in collisions of 6-MeV/u bare carbon ions with molecular hydrogen: Two-center mechanism and interference effect},
author = {Misra, Deepankar and Kelkar, A. and Kadhane, U. and Kumar, Ajay and Singh, Y. P. and Tribedi, Lokesh C. and Fainstein, P. D. and Centro Atomico Bariloche, Comision Nacional de Energia Atomica, Avenida E. Bustillo 9500, 8400 Bariloche},
abstractNote = {We report the energy and angular distribution of electron double differential cross sections (DDCS) in collision of 6-MeV/u C{sup 6+} ions with molecular hydrogen. We explain the observed distributions in terms of the two-center effect and the Young-type interference effect. The secondary electrons having energies between 1 and 1000 eV are detected at about 10 different emission angles between 30 degree sign and 150 degree sign . The measured data are compared with the state-of-the-art continuum distorted wave-eikonal initial state and the first Born model calculations which use molecular wave function. The single differential cross sections are derived and compared with the theoretical predictions. The oscillations due to the interference effect are derived in the DDCS ratios using theoretical cross sections for the atomic H target. The effect of the atomic parameters on the observed oscillations is discussed. An evidence of interference effect has also been shown in the single differential cross section. The electron energy dependence of the forward-backward asymmetry parameter shows a monotonically increasing behavior for an atomic target, such as He, which could be explained in terms of the two-center effect only. In contrast, for the molecular H{sub 2} the asymmetry parameter reveals an oscillatory behavior due to the Young-type interference effect superimposed with the two-center effect. The asymmetry parameter technique provides a self-normalized method to reveal the interference oscillation which does not require either a theoretical model or complementary measurements on the atomic H target.},
doi = {10.1103/PHYSREVA.75.052712},
journal = {Physical Review. A},
number = 5,
volume = 75,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}