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The high-temperature mass spectrometric method was employed to measure the equilibrium partial pressures of small germanium clusters above liquid germanium contained in a graphite Knudsen cell. These data were combined with new thermal functions, calculated from recent theoretical and spectroscopic molecular parameters, to evaluate the atomization enthalpies and enthalpies of formation of Ge[sub 5]-Ge[sub 8]. Mass spectrometric equilibrium data available in literature were also reevaluated. The following atomization enthalpies, Δ[sub a]H[sub 0][sup o](Ge[sub n],g) and enthalpies of formation Δ[sub f]H[sub 298.15][sup o](Ge[sub n],g), in kJ mol-1, have been obtained: Ge[sub 5], 1313±27 and 548±27, Ge[sub 6], 1649±33 and 583±33, Ge[sub 7], 2008±42 and 598±42, Ge[sub 8], 2359±60 and 618±60. The atomization energies are compared with available theoretical values.


Copyright 2000 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

The following article appeared in Gingerich, K. A., Gingerich, K., Schmude, R. W., Schmude Jr., R., Sai Baba, M., Baba, M. S., & Meloni, G. (2000). Atomization enthalpies and enthalpies of formation of the germanium clusters, Ge[sub 5], Ge[sub 6], Ge[sub 7], and Ge[sub 8] by Knudsen effusion mass spectrometry. Journal Of Chemical Physics, 112(17) and may be found at



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