Absorption coefficient, transition probability, and collision-broadening frequency of dimethylether at He-Xe laser 3.51-µ wavelength

The pressure dependence of the absorption coefficient of dimethylether (DME) gas at He-Xe laser 3.508-μ wavelength is measured. The experimental results are in fairly good agreement with theory. A collision-broadening frequency of
1.6 \pm 0.1 \times 10^{8}
second
^-1
at 15 torr, 293°K, and a transition lifetime of 2.2 ± 0.2 seconds are obtained. A saturation intensity of about 2 mW/cm
²
for 1 torr of DME is also estimated.