The pulse width of Xe(M) emission, whose photon energy is ~1keV, from Xe clusters excited by a subpicosecond intense laser pulse was estimated to be shorter than 100 ps. While that of Xe(N) emission, whose photon energy is ~100eV, was longer than 1 ns. The theoretical estimation of radiative recombination rates suggests that the observed keV x ray is a prompt x ray.
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Shiraishi et al. (2002) studied this question.
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