Absolute Infrared Intensities of the Fundamental Absorption Bands in Solid CO2 and N2O

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Abstract
Absolute infrared intensities of the fundamental vibrations of CO2 and N2O have been measured in polycrystalline solid films. The path length has been measured by observing interference fringes. In contrast with CS2, the results for the solid phase do not agree exactly with those predicted from the gas phase values, using only the simple ``field‐effect'' correction. In particular the intensity in the solid is less than that in the gas phase for v1 and v3 of N2O and for v3 of CO2, whereas the ``field‐effect'' predicts an increase in intensity. However, the observed changes in intensity are relatively small. The predicted frequency shifts also do not agree with the observed values, indicating that other effects are important. Bond moment parameters are presented. The bond moment μ is the same as in the gas phase, but the derivative, ∂μ/∂r, decreases by about 25%. Some incomplete studies of the intensities in mixed crystals of N2O and CO2 are presented.
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