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Optical gain was observed on the B → X transition of the Cs2+F− ionic excimer molecule at 185 nm. The excimer was produced by photoionization of CsF vapor with a laser-produced plasma source. An average net gain coefficient of 0.3 cm−1 was measured for 7 Torr of CsF and a 225-mJ pump laser.
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Tóth et al. (1993) studied this question.
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