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An enhancement of {~}100 of stimulated emission over spontaneous emission of the C vi 182-A{} line (one-pass gain {~}6.5) was measured in a recombining, magnetically confined plasma column by two independent techniques involving intensity calibrated extreme xuv monochromators. Additional confirmation that the enhancement was due to stimulated emission has been obtained with a soft x-ray mirror; with 12% measured effective reflectivity of the mirror, a 120% increase in intensity of the C vi 182-A{} line in the axial direction was observed.
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Suckewer et al. (1985) studied this question.
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