A new source for the search and study of electronic molecular spectra: the composite wall hollow cathode (CWHC)

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Abstract
The composite wall hollow cathode is a new type of source, set up for studies of the emission spectra due to electronic transitions in diatomic molecules. This lamp is characterised by the wide range of emitted spectra, its stability, its capacity to identify new molecules easily and to emit at low or very low rotational temperature. It enables an easy systematic search to be made for spectra which have not yet been observed. Moreover, the possibility of emission at different temperatures-and in particular at very low temperature-facilitates rotational studies. The best conditions of utilisation are described. The lamp is able to run for several months at an intensity of about 50 mA and, for a given low temperature of the discharge gases, it is approximately one hundred times more intense than a traditional hollow cathode lamp.