Answers are grounded in this paper and cite their sources.
It is suggested that coherent soft x rays can be produced by inverting the electron population in a suitable target, such as Li, through irradiation with x rays generated by fast electrons traversing an electromagnetic field (as in a storage ring). Conditions to be satisfied by target and radiation parameters are stated, and examples given.
No takes yet. Share an insight, caveat, or question.
Csonka et al. (1975) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: