Diode laser absorption studies of aluminium atoms produced in a direct current (dc) magnetron discharge with argon as well as argon/nitrogen and argon/oxygen mixtures as working gas are reported. The measured Al atom density increases with increasing discharge power. The observed temperature being in the range of 340–420 K rises with increasing power but shows little pressure dependence. A small admixture of oxygen gas leads to a complete disappearance of the absorption signal, a result which is not yet fully understood.
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Wolter et al. (2005) studied this question.
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