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Numerical calculations of laser-irradiated EuF₂ targets predict gain coefficients of 0.3--1.6 cm^-1 on several 4d-4p Ni-like Eu lines from 66 to 104.5 A{}. Dielectronic recombination is important both in determining the ionization balance and in populating the J=1,2 4d excited states. Targets which are optimized for 0-1 gain show significantly less effect due to trapping on the 0-1 line than on the 2-1 line.
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Maxon et al. (1988) studied this question.
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