Abstract
In a previous paper [1] the manufacturing, development and testing of a coherent submillimetric source was exposed. This source was obtained by difference frequency mixing of two CO2 TEA lasers.
In this present work, are presented the first results obtained with this mounting and concerning the collision induced spectrum of gaseous carbon dioxide at room temperature in the 4−40 cm−1 region.
The absorption coefficient α is calculated together with the first coefficients of its development as a function of density.
The curves α2/v 2=f(v) and α3/v 2=f(v), wherev is the frequency, are presented. They permit the calculation of the virial coefficients.
The results are then compared with those determined by an extrapolation in this frequency range, of measurements already made in CO2 in higher (optical) or lower (microwaves) frequencies.
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Occelli, R., Blancher, H., Bachet, G. et al. Difference-frequency source for very low optical frequencies spectroscopy: CO2 induced spectra. Int J Infrared Milli Waves 8, 465–477 (1987). https://doi.org/10.1007/BF01013259
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DOI: https://doi.org/10.1007/BF01013259