Saturation effect in the excitation of heliumlike Si projectiles in the intermediate velocity range

U. Tiwari, A. K. Saha, L. C. Tribedi, M. B. Kurup, P. N. Tandon, L. Gulyás

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The saturation effect in the excitation cross sections has been investigated for Si12+ ions colliding with gas target atoms (atomic number Z1 between 2 and 54) in the (8-12)-a.u. velocity range, both experimentally and theoretically. The experimental excitation cross sections have been deduced from the measured Ly x rays following the decay of the excited atoms. Theoretical calculations have been performed using the first Born approximation, the symmetric eikonal continuum distorted wave (SECDW) approximation, and the Schwinger variational principle (SVP). Similar to the earlier observations on the heavier ion species, the saturation has been found in both the experimental and the SVP cross sections in the entire velocity range. The SECDW approximation, however, has been found to underestimate the cross sections at large values of Zt in the presently investigated systems. In the light of these findings, the role of higher-order effects within different theoretical models has been reviewed and the possible interaction mechanisms have been discussed.

Original languageEnglish
Pages (from-to)4494-4500
Number of pages7
JournalPhysical Review A
Volume58
Issue number6
Publication statusPublished - Dec 1998

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projectiles
saturation
cross sections
variational principles
excitation
continuums
approximation
Born approximation
atoms
heavy ions
decay
gases
ions
x rays
interactions

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Atomic and Molecular Physics, and Optics

Cite this

Tiwari, U., Saha, A. K., Tribedi, L. C., Kurup, M. B., Tandon, P. N., & Gulyás, L. (1998). Saturation effect in the excitation of heliumlike Si projectiles in the intermediate velocity range. Physical Review A, 58(6), 4494-4500.

Saturation effect in the excitation of heliumlike Si projectiles in the intermediate velocity range. / Tiwari, U.; Saha, A. K.; Tribedi, L. C.; Kurup, M. B.; Tandon, P. N.; Gulyás, L.

In: Physical Review A, Vol. 58, No. 6, 12.1998, p. 4494-4500.

Research output: Contribution to journalArticle

Tiwari, U, Saha, AK, Tribedi, LC, Kurup, MB, Tandon, PN & Gulyás, L 1998, 'Saturation effect in the excitation of heliumlike Si projectiles in the intermediate velocity range', Physical Review A, vol. 58, no. 6, pp. 4494-4500.
Tiwari, U. ; Saha, A. K. ; Tribedi, L. C. ; Kurup, M. B. ; Tandon, P. N. ; Gulyás, L. / Saturation effect in the excitation of heliumlike Si projectiles in the intermediate velocity range. In: Physical Review A. 1998 ; Vol. 58, No. 6. pp. 4494-4500.
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