We report on the kinetic Boltzmann approach adapted for simulations of highly ionized matter created from a solid by its x-ray irradiation. X rays can excite inner-shell electrons, which leads to the creation of deeply lying core holes. Their relaxation, especially in heavier elements, can take complicated paths, leading to a large number of active configurations. Their number can be so large that solving the set of respective evolution equations becomes computationally inefficient and another modeling approach should be used instead. To circumvent this complexity, the commonly used continuum models employ a superconfiguration scheme. Here, we propose an alternative approach which still uses "true" atomic configurations but limits their number by restricting the sample relaxation to the predominant relaxation paths. We test its reliability, performing respective calculations for a bulk material consisting of light atoms and comparing the results with a full calculation including all relaxation paths. Prospective application for heavy elements is discussed.

Center for Free Electron Laser Science CFEL Deutsches Elektronen Synchrotron DESY Notkestrasse 85 22607 Hamburg Germany

Center for Intense Lasers and Applications University of Bordeaux 1 351 Cours de la Liberation F 33405 Talence France

Department of Radiation and Chemical Physics Academy of Sciences of the Czech Republic Na Slovance 2 182 21 Prague Czech Republic

Institute of Experimental Physics University of Gdansk ulica Wita Stwosza 57 80 952 Gdansk Poland

Institute of Nuclear Physics Polish Academy of Sciences Radzikowskiego 152 31 342 Kraków Poland

Citace poskytuje Crossref.org

Application of Boltzmann kinetic equations to model X-ray-created warm dense matter and plasma