Abstract
The composition of selenium vapor evaporating from liquid selenium has been studied mass‐spectrometrically using single and double‐oven type Knudsen effusion cells. The appearance potentials have been determined for various molecular species . The heats of vaporization of Se2, Se5, Se6, Se7, and Se8 at 625°K have been obtained and the heat of fusion of selenium has been derived. The average molecular weight of the selenium vapor has been determined from the simultaneous measurements of vapor pressure by Knudsen and torsion effusion methods.
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