Citation:
Abstract:
We have used a three-channel version of a tunable difference frequency laser spectrometer to measure the collisionallyinduced lineshifts at room temperature for 26 lines of the fundamental band of CO perturbed by nitrogen. Each lineshift wasobtained directly by comparing the line center positions of two simultaneous recordings, one for a pressure-shifted line, andthe other for the same line in pure CO line at very low pressure. The experimental results are found to be in complete agreementwith earlier measurements and confirm that shifts as small as 3 MHz may be measured in such a system. Our results arecompared with theoretical calculations. The part of the shifting coefficient antisymmetric with respect to a change in sign ofthe line number m, is in disagreement with the calculations. © 1999 Academic Press