The technique of using two laser-produced plasmas for absorption spectroscopy of moderately ionized species has been greatly improved. In particular a new signal detection system and a new data processing technique have been applied in the experiment with quite good results as regards both signal to noise ratio and spectral resolution. The absorption spectra of the 1 s electron of the Be IV, III, II, I ions are shown together with the corresponding computed photoionization cross section spectra in the XUV as an example of the performances of the experiment.
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Jannitti et al. (1987) studied this question.
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