INFRARED SPECTRA OF MOLECULAR CRYSTALS.
Abstract
Studies were carried out to characterize and explain the infrared absorption and reflectance spectra of molecular crystals. Accurate methods of measuring reflectance spectra and of processing the data to obtain optical constants were developed and applied to sodium chlorate. Absolute infrared absorption intensities were measured for ethylenes, benzenes, acetylene and ethane. Theoretical studies of crystal splitting and lattice frequencies in benzene have provided data concerning intermolecular forces in this crystal splitting of ungerade vibrations, and provide the restoring force for torsional lattice motion. Phase changes in adamantane, cyclohexane and hexamethylbenzene were studied. Spectroscopically observable changes occuring at the phase transition temperature yield information concerning the molecular motions. Crystal spectra were used to aid in vibrational assignment of hydrazoic acid and cyclohexane. The unique properties of the crystal spectrum were of critical value in each case. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 1966
- Accession Number
- AD0635579
Entities
People
- David A. Dows
- G. Audermann
- L. Rubenstein
- N. Rich
Organizations
- University of Southern California