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Vaporization studies on elemental tellurium and selenium were conducted by Knudsen effusion mass spectrometry in the temperature range of 590–690K and 380–480K, respectively.The ionic species Tei+ (i=1–7) and Sei+(g) (i=1–9) were detected in the mass spectra over these two condensed phases. Measurement of ion intensities were performed as a function of electron impact energy and as a function of temperature...
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