MASS-SPECTROMETRIC INVESTIGATION OF THE THERMODYNAMIC PROPERTIES OF THE SI-5 MOLECULE

被引：35

作者：

RAN, QS ^{[1
]}

SCHMUDE, RW ^{[1
]}

MILLER, M ^{[1
]}

GINGERICH, KA ^{[1
]}

机构：

[1] TEXAS A&M UNIV,DEPT CHEM,COLLEGE STN,TX 77843

来源：

CHEMICAL PHYSICS LETTERS | 1994年 / 230卷 / 4-5期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0009-2614(94)01169-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The partial pressures of Si(g) and Si-5(g) over condensed silicon have been determined by Knudsen effusion mass spectrometry. Thermal functions for Si-5 have been calculated from recent theoretical results. The values for the atomization enthalpy and the enthalpy of formation for gaseous Si-5 are: Delta H-a,H-0, = 1559 +/- 24 kJ mol(-1) and Delta H-f,H-298,H-15 = 700 +/- 24 kJ mol(-1). The fragmentation energy for Si-5 is determined as 399 kJ mol(-1). Recent theoretical predictions are in good agreement with our experimental results.

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页码：337 / 342

页数：6

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