Abstract
Experimental cross sections and cross-section ratios reported in the literature for direct double ionization of the outer shells of helium, neon, and argon atoms resulting from bare ions ranging from protons to uranium and for antiprotons are analyzed in terms of a first- and second-order interference model originally proposed by McGuire [J. H. McGuire, Phys. Rev. Lett. 49, 1153 (1982) PRLTAO0031-900710.1103/PhysRevLett.49.1153]. Empirical formulas for the various contributions to double ionization plus information about the phase difference between the first- and second-order mechanisms are extracted from the data. Projectile and target scaling's are also extracted. Total cross sections and their ratios determined using these formulas and scaling's are shown to be in very good agreement with experimental data for lower-Z projectiles and impact velocities larger than 1 a.u. For very-high-Z projectiles, the amount of double ionization is overestimated, probably due to saturation of probabilities that is not accounted for in scaling formulas.
Recommended Citation
R. D. DuBois et al., "Empirical Formulas for Direct Double Ionization by Bare Ions: Z=-1 to 92," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 90, no. 5, article no. 052721, American Physical Society, Nov 2014.
The definitive version is available at https://doi.org/10.1103/PhysRevA.90.052721
Department(s)
Physics
International Standard Serial Number (ISSN)
1094-1622; 1050-2947
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 American Physical Society, All rights reserved.
Publication Date
25 Nov 2014
Comments
National Science Foundation, Grant None