Essentially monochromatic radiation with a frequency corresponding to the frequency of the line center of the P(20) line of the 961-cm−1 CO2 band was obtained from a CO2 laser. Using this radiant energy, transmittances of CO2 samples were measured as various broadening gases were added. Self-broadening coefficients of CO2 relative to nitrogen, hydrogen, helium, and argon were determined from the measurements characterizing the transmittance only at the line center; from these measurements ratios of optical collision diameters are calculated.
© 1968 Optical Society of America
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