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Measurements of the band heads and of the partially resolved rotational structure of the MgF absorption bands are used to evaluate the following constants for the ²Σ, ²Σ system: ν₀₀=37,187.4 cm^-1, B₀^'=0.537, B₀^''=0.518±0.010, r₀^''=1.75×10^-8 cm and for the ²Π, ²Σ system: ν₀₀=27,846.5, B₀^'=0.529, B₀^''=0.518, A=-34.3 (or +38.3). The isotope effect of Mg is observed in the +1 sequence of ²Σ, ²Σ bands. The BeF bands do not appear in absorption under similar conditions.
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Jenkins et al. (1934) studied this question.
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