Doubly excited autoionizing states in barium of the configuration 6p3/2np ($n>~12$) are shown to decay preferentially to yield the 6p1/2 excited state of Ba⁺. The resulting population inversion is used to produce amplified spontaneous emission at 493 and 650 nm corresponding to the 6p1/2-6s1/2 and 6p1/2-5d3/2 transitions in Ba⁺. This principle of selective autoionization is expected to be applicable to the construction of a new class of ion lasers extending into the vacuum-ultraviolet wavelength region.
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Bokor et al. (1982) studied this question.
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