By combining the technique of exploding foils with inner-shell photoionization, we predict that lasing can occur for x rays below 50 {} in Cu-like ions. As an example, we work out the case for Cu-like iodine (I²⁴⁺) which should lase on the 3d⁹4s²→3d¹⁰4p doublet calculated at 24.565 and 26.026 {} with integrated line energies comparable to the selenium x-ray laser.
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Morley et al. (1988) studied this question.
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