Abstract
The emission spectrum of NiCl has been reinvestigated in a H.F. discharge from a 500 W oscillator using high dispersion. This study has led to a revision of the vibrational analysis of several doublet systems of bands recently reported in thermal emission using low dispersion. The bands of NiCl in the region λλ 340.0–560.0 nm have been analysed as belonging to several doublet systems of bands degraded to red, some of which have a common lowerA 2 Π i state and others with a common ground stateX 2Σ, analogous toA 2 Π i andX 2Σ states of NiF recently established from a detailed rotational analysis of two doublet systems in the visible region. The vibrational analysis of some of the systems have also been confirmed from a study of both chloride and nickel isotope effects observed in Δv=±1 sequences.
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