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Several possible schemes for new coherent XUV radiation sources based on collisional energy transfer from rare gas metastables produced in a discharge to quartet states of alkali metal atoms are described. Relevant laser parameters have been analyzed for He-K and Ne-Rb mixtures with possible laser gain up to several cm-1in the 60-80 nm spectral region.
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Papanyan et al. (1983) studied this question.
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