Absorption coefficients and frequency shifts measurement in the spectral range of 1071.88-1084.62 cm−1 vs. pressure for chlorodifluoromethane (CHClF2) using tunable CW CO2 laser

► Absorption coefficients were determined vs. the gas pressure at lines of 9R branch for CFC-22. ► Lines were selected according to IR spectrum of this gas given by HITRAN cross section database. ► Frequency shifts of absorption lines vs. pressure have given an appropriate explanation to the lines absorption. ► Absorption cross sections for CFC-22 were defined and compared with HITRAN cross section database.