Knowledge Bank

Prequencies and intensities for the $a1\Delta g\to X3\Sigma g-$ transition at 60, 300 and 600 torr $O2$ and 600 torr dry air at $296\circ K$ have been measured in absorption using the Fourier transform spectrometer at the McMath Solar Telescope of Kitt Peak National Observatory. Transitions for $OP,PP,QP,PQ,QQ,RQ,QR,RR$ and $SR$ branches were observed to J=27. A calibration of the frequency scale to the $N2O00\circ 2$ band allow an absolute determination of the transition frequencies to $10-4cm-1.1$ Consequently, results have been obtained for the self-shift, $N2$ shift, self-broadening and $N2$ broadening coefficients. The intensity measurements are accurate to better than one percent for a majority of the observed lines. These measurements are used to calibrate the frequency and airmass of atmospheric observations.