Accession Number : AD0763686

Title :   The Vibrational Spectra of Solid Fluorine.

Descriptive Note : Technical rept.,

Corporate Author : MICHIGAN STATE UNIV EAST LANSING DEPT OF CHEMISTRY

Personal Author(s) : Niemczyk,T. M. ; Getty,R. R. ; Leroi,G. E.

Report Date : JUL 1973

Pagination or Media Count : 22

Abstract : Raman and far infrared spectra of crystalline fluorine have been obtained in both solid phases. As expected for the disordered higher temperature form, only the Raman-active stretching fundamental is observed for beta-F2. The predictions of a preliminary calculation of the optically active lattice frequencies for the low temperature phase are in poor agreement with the observed lattice frequencies, suggesting that an improved model will be required to help distinguish the correct alpha-F2 crystal structure. Solid fluorine more closely resembles oxygen than it does the other halogens. In particular, the intermolecular forces are extremely weak, as exemplified by the small shifts of the internal frequencies from their gas phase values, the absence of observable factor group splitting of the fundamental and the overtone, and the relatively low values of the external (lattice) frequencies. (Modified author abstract)

Descriptors :   (*FLUORINE, *INFRARED SPECTRA), (*RAMAN SPECTROSCOPY, FLUORINE), SOLIDIFIED GASES, CRYSTAL STRUCTURE

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE