Band systems in the extreme violet have been excited in `vacuum' arcs in oxygen, ordinary water vapour and heavy-water vapour, and also in a flame. Wavelengths of MgOH and MgOD bands are listed. An oxide system in the same region has been studied under large dispersion but is too complicated to analyse; it is attributed to a polyatomic emitter, possibly Mg 2 O 2 .
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Alfred Gordon Gaydon (1959) studied this question.
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