Charge-exchange-induced formation of hollow atoms in high-intensity laser-produced plasmas

For the first time registration of high-resolution soft x-ray emission and atomic data. calculations of hollow-atom dielectronic satellite spectra of highly charged nitrogen have been performed. Double-electron charge-exchang e processes from excited stares are proposed for the formation of autoioniz ing levels nln'l' in high-intensity laser-produced plasmas. when field-ioni zed ions penetrate into the residual gas. Good agreement is found between t heory and experiment. Plasma spectroscopy with hollow ions is proposed and a temperature diagnostic for laser-produced plasmas in the long-lasting rec ombining regime is developed.