Infrared Emission as Studied through the Temperature Dependence of Integrated Intensities of a Molecular Crystal

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Abstract
The expression for the integrated intensity of an infrared absorption band is normally obtained by neglecting spontaneous emission. At high temperatures, the emission term cannot be ignored, and in fact gives rise to a decrease in apparent absorption intensity with increasing temperature. We have studied this effect experimentally with the molecular crystal copper phthalocyanine at temperatures up to 600°C. Expressions based on the assumption of a harmonic potential function, and retaining only linear terms in the dipole-moment operator have been derived for the temperature dependence of the fundamental absorptions. These expressions compare favorably with the experimental data.

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