Spectra of multiply charged hollow ions the plasma produced by a short-wavelength nanosecond laser

Complex spectral structures located between the resonance lines of H- and H e-like MgXII and MgXI ions were recorded in experiments on plasma heating b y the radiation of a low-power short-wavelength excimer XeCl laser (12-ns p ulses with an energy of 2 J). The above spectral structures were shown to a rise from transitions in the so-called hollow multicharged ions, i.e., in i ons with an empty Is-shell, which were previously observed in laser produce d plasmas only with ultrahigh-power femto- and picosecond laser facilities having extremely high-contrast laser pulses.