Spectroscopy and physics of atoms and molecules

Effect of radiation trapping on the X-ray emission spectra of multiply charged iron ions formed by ultrarelativistic laser pulses on thin foils

M. A. Alkhimova, I. Yu. Skobelev

Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow

Abstract: This paper presents the results of atom-kinetic calculations showing a significant influence of self-absorption effects on the X-ray emission spectra of plasmas formed by irradiation of thin iron foils with ultra-relativistic laser pulses. Using the spectra of hydrogen-like and helium-like iron ions as an example, it is shown that during two-pulse irradiation of the target, the relative macroscopic motion of different regions of the laser plasma with respect to each other leads to an asymmetry of the contours and a significant change in the intensity ratios of the spectral components, but can compensate for the self-absorption effects associated with the heating of the pre-plasma.

Keywords: X-ray spectroscopy, high-temperature laser plasma, X-ray spectra, self-absorption effect, multiply charged ions.

Received: 20.03.2025
Revised: 30.04.2025
Accepted: 08.07.2025

DOI: 10.61011/OS.2025.08.61505.7708-25

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