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A pulsed source of sufficiently high power is proposed to obtain the spark spectrum of oxygen under atmospheric pressure and within both the visible and ultraviolet range of the spectrum. A simply made ignition circuit starts the discharge and allows determination of 100 ppm of oxygen in an argon atmosphere. To improve the limit of sensitivity, it is necessary on the one hand to have a transfer of energy from metastable atoms of one element, and on the other hand to avoid the formation of a continuum as a result of transitions between the free and bound states. The use of a helium atmosphere thus allows the improvement of the limit of sensitivity to 20 ppm.
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Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques, 31 Allée J. Guesde, 31400 Toulouse, France.
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Dorignac
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