Eur. Phys. J. D 42, 387-392 (2007)
https://doi.org/10.1140/epjd/e2007-00139-0

Coupling and ionization effects on hydrogen spectral line shapes in dense plasmas

¹ Laboratoire de Physique des Interactions Ioniques et Moléculaires, CNRS UMR6633, Université de Provence, centre St Jérôme, case 232, 13397 Marseille Cedex 20, France
² Institute of Spectroscopy, Troitsk, Moscow region, 142190, Russia
³ Russian Research Center “Kurchatov Institute”, Moscow, 123182, Russia

Corresponding authors: ^a annette.calisti@up.univ-mrs.fr - ^b bureyeva@sci.lebedev.ru - ^c lisitsa@nfi.kiae.ru

Received: 28 July 2006
Revised: 14 February 2007
Published online: 30 March 2007

Abstract

A study of hydrogen lines emitted in dense and low temperature plasmas is presented. Coupling and ionization effects in a transition from impact to quasi-static broadening for electrons are analyzed with the help of the Frequency Fluctuation Model (FFM). Electron broadening of Balmer series lines is studied for different densities and temperatures spanning a wide domain from impact to quasi-static limit. It is shown that electronic broadening makes a transition from impact to quasi-static limit depending on plasma conditions and principal quantum number. Even for the Balmer alpha line, at a density equals 10¹⁸  cm^-3 and a temperature equals 1 eV, this transition occurs both in the wings and the core of the line.