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Using a tunable frequency-stabilized CO2 laser, the pressure dependences of unsaturated absorption coefficients (AC) are measured in pure carbon dioxide in the pressure range from 5 to 30 Torr, where the spectral line shape is described by the Voigt profile. The absorption coefficients are measured in the centers of R(8), R(22), R(34), P(22), and P(36) spectral lines of the 1000–0001 transition in the temperature range 300–700 K. By means of the least-squares method, the inverse problem is solved for the system of equations for AC at different pressures in the temperature range under study. The self-broadening coefficients \({\gamma _{C{O_2} - C{O_2}}}\) and the probabilities of spontaneous emission A  ik  are derived. A new formula is proposed for \({\gamma _{C{O_2} - C{O_2}}}\) (T) dependence.

Collisional self-broadening coefficients and probabilities of spontaneous emission of the CO2 1000–0001 transition lines