Line Profiles of Ni-like Collisional XUV Laser Amplifiers: Particle Correlation Effects

Annette Calisti (1) , Sandrine Ferri (1) , Caroline Mossé (1) , Bernard Talin (1) , Annie Klisnick (2) , Limin Meng (2) , Djamel Benredjem (3) , Olivier 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

The effects of particle correlations on the spectral broadening due to the radiator motion (Doppler broadening) are discussed for a Ni-like XUV laser line pumped in two different regimes of collisional excitation. The transient pumping for which ionic temperature is relatively low (the plasma coupling parameters is large), and the quasi steady-state pumping (QSS) for which the ionic temperature is higher and the plasma coupling parameter of the order of 1 are considered. It is shown by using classical Molecular Dynamics simulation techniques that in both cases the effect of correlations modify the radiator-motion broadened profiles and cannot be neglected in evaluating Doppler effect. This is due to the fact that the radiator velocity changes during the radiation emission resulting in a mixing of velocities in the line profile. It is also shown that this results in a homogenization of the intrinsic line profiles.

Mots clés: Line shapes; Doppler broadening; X-ray lasers; Molecular Dynamics simulations; velocity-changing effects

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

Annette Calisti, Sandrine Ferri, Caroline Mossé, Bernard Talin, Annie Klisnick, et al.. Line Profiles of Ni-like Collisional XUV Laser Amplifiers: Particle Correlation Effects. High Energy Density Physics, 2013, 9, pp.516-522. ⟨10.1016/j.hedp.2013.05.004⟩. ⟨hal-00720106v2⟩