Number densities of helium singlet and triplet metastable states in the hollow cathode discharge appropriate to metal vapour lasers have been measured; in particular their dependence on discharge current and pressure, cathode fall potential and cadmium partial pressure has been explored. Singlet and triplet densities behave differently with discharge parameters; whereas the former saturate with both current and pressure, the latter increase linearly with discharge current and follow the distinctive behaviour exhibited by the cathode fall potential as a function of pressure. Radial profiles of the metastable densities are also reported.
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McIntosh et al. (1978) studied this question.
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