Mass spectrometric study of inter-group IVB molecules

The systems germanium-graphite and germanium-silicon-carbon have been studied. Several gaseous molecules containing Ge, Si, and/or C were observed and their dissociation energies determined from measured partial pressures. A general picture of the dissociation energies of di-, tri-, and tetraatomic intergroup IVB molecules is deduced from these measurements.Incidental to this study the vapor pressure of pure Si was determined; the result confirms the heat of sublimation obtained previously.