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Mass spectrometric investigation of the thermodynamic properties of the Si5 molecule

✍ Scribed by Qingsheng Ran; Richard W. Schmude Jr.; Miroslaw Miller; Karl A. Gingerich

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 535 KB
Volume: 230
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(94)01169-9

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✦ Synopsis

The partial pressures of Si(g) and S&(g) over condensed silicon have been determined by Knudsen effusion mass spectrometry. Thermal functions for Si, have been calculated from recent theoretical results. The values for the atomization enthalpy and the enthalpy of formation for gaseous Si, are: LIH,,~= 1559 i 24 kJ mol-' and fWf,298.11= 700 !I 24 kJ mol-'. The fragmentation energy for Si, is determined as 399 kJ mol-r. Recent theoretical predictions are in good agreement with our experimental results.

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