Raman Spectra of Solid CO2, N2O, N2, and CO

摘要

The Raman spectra of solid CO2, N2O, N2, and CO have been observed. Each spectrum can be analyzed by assuming an approximately ordered structure isomorphous with that of CO2. The lattice mode intensities have been calculated on the basis of the oriented gas model; they are in good agreement with the measured values and lead to confident assignments of the observed bands. The frequencies of theEgand twoTglibrations are 73.5, 91.5, and 132 cmminus;1, respectively, for CO2(15deg;K) and 68, 82, and 124.5cmminus;1, respectively, for N2O (15deg;K). Inagr;hyphen;N2at 16deg;K two sharp bands are observed at 33.5cmminus;1lpar;Egrpar;and 37.5cmminus;1lpar;Tgrpar;. The otherTgmode may coincide with theEg. Only one broad, asymmetric lattice band is observed foragr;hyphen;CO, which is located at 47.5cmminus;1at 12deg;K. The peak frequencies of these bands decrease an average of sim;thinsp;15percnt; on warming from 15deg;K to the phase transition, and there is a considerable concommitant increase in their widths.