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.
J. Chem. Phys.

Drowart, J., De Maria, G., Boerboom, A. J. H., & Inghram, M. G. (1959). Mass spectrometric study of inter-group IVB molecules. J. Chem. Phys., 30, 308–313. doi:10.1063/1.1729893