Study of the parameters of the collisionally broadened R22 absorption line of the 1000-0001 transition in CO2 molecules: I. Experiment

Abstract

Unsaturated absorption coefficients in pure carbon dioxide at pressures of 1 and 100 Torr and in CO 2 -N 2 and CO 2 -He binary mixtures at a pressure of 100 Torr have been measured in the temperature range of 296-700 K using a frequency stabilized tunable CO 2 laser. The collisional self broadening coefficient, the relative coefficients of collisional broadening caused by N 2 and He buffer gases, and their temperature depen dences have been determined for the R22 absorption line of the 10 0 0-00 0 1 transition in CO 2 molecules.

Temperature‐Dependent Line‐Broadening Effects in CO2 Caused by Ar

“…00001 band using dual frequency comb absorption and phase spectroscopy up to 25 bar and 1000 K, while Chen et al [18] applied tunable diode laser absorption spectroscopy for transitions with high J values, where J is the quantum number characterizing the overall rotation of the molecule. Furthermore, Arshinov and co-workers [22][23][24] utilized a frequency-stabilized CO 2 laser to probe the unsaturated absorption coefficients of lines in the 10001 ! 00011 band in pure CO 2 , as well as in binary mixtures of CO 2 with various gases, including Ar, in the temperature range of 296-700 K.…”

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

“…1. MEASUREMENT PRoCEDURE In the general case, the unsaturated absorption coefficient (AC) at the central frequency v0 of any 1000-0001 transition Co2 line can be represented in the form [5]:…”