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Forbidden transitions in excitation by proton impact in Li-like Al ions

Published online by Cambridge University Press:  19 June 2007

V. Stancalie
Affiliation:
National Institute for Laser, Plasma and Radiation Physics, Bucharest, Romania
V. Pais
Affiliation:
National Institute for Laser, Plasma and Radiation Physics, Bucharest, Romania
M. Totolici
Affiliation:
National Institute for Laser, Plasma and Radiation Physics, Bucharest, Romania Politehnica University, Faculty of Electronics, Bucharest, Romania
A. Mihailescu
Affiliation:
National Institute for Laser, Plasma and Radiation Physics, Bucharest, Romania

Abstract

This paper presents cross-sections and collision strengths for proton-impact excitation of optically forbidden transitions in Al10+. These data, calculated in the impact-parameter formalism, covering the expected range of energies/temperature in laser-produced plasmas, are believed to represent the first such detailed treatment of this system. The cross-sections decrease with energy as E−1, while the collision strengths tend to finite limits as the energy of colliding proton becomes infinitely great. This high-energy limiting value has been evaluated combining results from the semi-classical treatment of ion-impact excitation processes and the Born approximation for high-energy behavior of the collision strength. The effective target size has been estimated from the calculated high-energy limit of the collision strength in the Born approximation.

Type
Research Article
Copyright
© 2007 Cambridge University Press

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