Study of particle correlation effects on line profiles of Ni-like collisional XUV laser amplifier

Annette Calisti (1) , S. Ferri (1) , C. Mossé (1) , B. Talin (1) , A. Klisnick (2) , Limin Meng (2) , D. Benredjem (3) , O. Guilbaud (4)

1 PIIM - Physique des interactions ioniques et moléculaires
2 ISMO - Institut des Sciences Moléculaires d'Orsay
3 LAC - Laboratoire Aimé Cotton
4 LPGP - Laboratoire de physique des gaz et des plasmas

We discuss the effects of particle correlations on the spectral broadening due to the radiator motion (Doppler broadening) for a Ni-like XUV laser line pumped in two different regimes (transient and quasi-steady state regimes) of collisional excitation. In a medium with gain, radiative transport effects modify the observed profile and these modifications depend on the homogeneous or inhomogeneous nature of the intrinsic profile (be- fore amplification). The intrinsic line profile is usually described by a Voigt profile, which is the convolution of a Lorentzian profile due to the different homogeneous broadenings (electron collision-induced transitions and spon- taneous emission) and an inhomogeneous Gaussian profile due to Doppler shifts (due to the radiator motion in the free-particle limit). In this paper, it is shown that accounting for the correlations between particles modifies no- ticeably the radiator-motion broadened profiles, whatever the densities and temperatures values.

Domaines: Physique des plasmas [physics.plasm-ph]

Annette Calisti, S. Ferri, C. Mossé, B. Talin, A. Klisnick, et al.. Study of particle correlation effects on line profiles of Ni-like collisional XUV laser amplifier. X−Ray Lasers 2012, Jun 2012, Paris, France. pp.49-53, ⟨10.1007/978-3-319-00696-3_2⟩. ⟨hal-00880871⟩