Exploding-foil-photoionization x-ray laser

Abstract
By combining the technique of exploding foils with inner-shell photoionization, we predict that lasing can occur for x rays below 50 Å in Cu-like ions. As an example, we work out the case for Cu-like iodine (I24+) which should lase on the 3d94s23d104p doublet calculated at 24.565 and 26.026 Å with integrated line energies comparable to the selenium x-ray laser.