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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