Spontaneous emission probabilities and collisional line widths of 0001–[1000, 0200]I,II lasing transitions in the CO2 molecule

A frequency-stabilized tunable CO₂ laser was used to measure the absorption coefficients for the J = 6–34 lines in the R and P branches of the 00⁰1-[10⁰0,02⁰0]_I,II transitions in CO₂ with an error of less than 1% in the pressure range of 1–200 Torr at room temperature. A specially developed method was used to calculate the spontaneous emission probabilities A mn and the collisional line widths 2Δν_L from the measured absorption coefficients at pressures corresponding to the Voigt and Lorentzian line profiles. The data obtained were approximated by analytic expressions describing the dependences of A_mn and 2Δν_L on the rotational quantum number J. The squares of the matrix elements of the moments of the transitions were calculated for all the lines under study.