ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The density dependent integrated intensities of the interaction induced (ii) dipole forbidden Raman spectra of the CO2 ν2(πu) mode have been calculated by the use of statistical mechanics based on the quadrupole–induced-dipole (QID) mechanism. The calculated intensities were compared with experimentally determined intensities. The intensities examined were between 5.03 to 17.00×1021 molecules/cm3 and the temperatures examined were 50 and 75 °C. The results indicated that at densities up to approximately 2.5× the triple point density, the integrated intensities can be expressed as a function of the density squared. This density square dependence of the integrated intensity may be due to almost perfect cancellation between constructive intensity originated from (CO2)2 dimers and the destructive intensity of classical three body interactions which have also been calculated. In any case, extra intensity was present as a high frequency shoulder at all densities except the lowest and highest values and was not accounted for by our calculations.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.457594
