Volume 108, Number 5, December 2014
|Number of page(s)||6|
|Section||Atomic, Molecular and Optical Physics|
|Published online||05 December 2014|
Generalized atomic processes for interaction of intense femtosecond XUV- and X-ray radiation with solids
1 Univ. Bordeaux, CEA, CNRS, CELIA (Centre Lasers Intenses et Applications), UMR 5107 F-33400 Talence, France
2 Sorbonne Universités, Pierre et Marie Curie UPMC, UMR 7605, LULI - case 128, 4 place Jussieu, F-75252 Paris Cedex 05
3 LULI, Ecole Polytechnique, CNRS, CEA, Physique Atomique dans les Plasmas Denses PAPD Route de Saclay, F-91128 Palaiseau, France
Received: 3 September 2014
Accepted: 17 November 2014
Generalized atomic processes are proposed to establish a consistent description from the free-atom approach to the heated and even up to the cold solid. It is based on a rigorous introduction of the Fermi-Dirac statistics, Pauli blocking factors and on the respect of the principle of detailed balance via the introduction of direct and inverse processes. A probability formalism driven by the degeneracy of the free electrons enables to establish a link of atomic rates valid from the heated atom up to the cold solid. This allows to describe photoionization processes in atomic population kinetics and subsequent solid matter heating on a femtosecond time scale. The Auger effect is linked to the 3-body recombination via a generalized 3-body recombination that is identified as a key mechanism, along with the collisional ionization, that follows energy deposition by photoionization of inner shells when short, intense and high-energy radiation interacts with matter. Detailed simulations are carried out for aluminum that highlight the importance of the generalized approach.
PACS: 32.80.Aa – Inner-shell excitation and ionization / 32.80.Zb – Autoionization / 78.70.-g – Interactions of particles and radiation with matter
© EPLA, 2014
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