Accession Number:

AD0263127

Title:

THE INFRARED SPECTRUM AND THERMODYNAMIC PROPERTIES OF GASEOUS SULFUR TRIOXIDE

Descriptive Note:

Corporate Author:

WASHINGTON UNIV SEATTLE

Personal Author(s):

Report Date:

1961-08-31

Pagination or Media Count:

1.0

Abstract:

THE IR spectrum of SO3 was under prism resolution in both the gaseous state and in Xe matrices at liquid N temperature. In both cases it was found that a satisfactory vibrational assignment of the spectrum of monomeric SO3 could be made on the basis of a simple D sub 3h symmetry model. The IR fundamentals of SO3 in the Xe matrix spectrum were essentially the same as those of the gas phase except the v2a2 mode was shifted to 1464 cm. A normal coordinate treatment of the SO3 molecule was carried out. Potential constants were determined for both Urey-Bradley and simplified valence force fields. Three weak absorption bands of S3O9 were detected in the gas phase spectrum. It was estimated that for the trimerization reaction, the heat of reaction at absolute zero was approximately 30 kcalmole and K sub p was approximately unity at 298 K. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE