Accession Number:

AD0262801

Title:

THE INFRARED SPECTRA AND STRUCTURES OF THE CRYSTALLINE PHASES OF CH4 AND CD4

Descriptive Note:

Corporate Author:

PRINCETON UNIV NJ

Report Date:

1961-08-15

Pagination or Media Count:

1.0

Abstract:

IR spectra of CH4 and CD4, in the region of the stretching and bending modes were obtained in all of their crystalline phases between 5 K and 40 K. The spectra of dilute solutions of CH4 and CD4 in one another were studied through the same temperature range. The spectra of the dilute solutions consist of single sharp lines for both fundamentals, demonstrating that the barriers to molecular rotation are high in all the phases. The fine structure observed in the low temperature phases of pure crystals is inconsistent with any of the structural models heretofore proposed but 2 models for phase II are suggested which are consistent with the spectra and which show efficient packing. Phase III of CD4 is probably complex and of low symmetry. Phase I is probably disordered. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE