Pressure broadening of the dipole and Raman lines of CO2 by He and Ar. Temperature dependence

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Abstract
Pressure broadening of CO2 lines by He and Ar is studied using a priori (electron gas plus van der Waals) potential energy surfaces and infinite‐order sudden approximation dynamics. The linewidths of both dipole line (from vibration–rotation transitions) and Raman lines (from pure rotational transitions) are calculated as functions of the temperature over the range 200 to 800 °K. The dependence on uncertainties in the potential energy surfaces is also explored. Experimental results are available only at room temperature; agreement of the calculated results with them is good for small rotational quantum numbers j and deviates about as expected for large j. Accurate experimental studies of the temperature dependence of pressure broadening are suggested.