Lineshifts in the Fundamental Band of CO: Confirmation of Experimental Results for N(2) and Comparison with Theory.
We have used a three-channel version of a tunable difference frequency laser spectrometer to measure the collisionally induced lineshifts at room temperature for 26 lines of the fundamental band of CO perturbed by nitrogen. Each lineshift was obtained directly by comparing the line center positions of two simultaneous recordings, one for a pressure-shifted line, and the other for the same line in pure CO line at very low pressure. The experimental results are found to be in complete agreement with earlier measurements and confirm that shifts as small as 3 MHz may be measured in such a system. Our results are compared with theoretical calculations. The part of the shifting coefficient antisymmetric with respect to a change in sign of the line number m, is in disagreement with the calculations. Copyright 1999 Academic Press.
Luo
C
Department of Physics, University of Toronto, Toronto, M5S 1A7, Canada
Berman
R
Predoi-Cross
A
Drummond
JR
May
AD