THE INFRARED ABSORPTION SPECTRUM OF METHYL IODIDE IN THE 2.3 MICRON $REGION^{*}$

$^{*}$ Supported by the National Science Foundation (Grant NSFG-5959).Author Institution: Michigan State UniversityThis region was found to contain several overlapping perpendicular bands. On the low frequency end $\nu_{2}-\nu_{1}$ has been identified and analyzed using lines in the P and R series of the sub-bands observed under high resolution ($\approx 0.07 cm^{-2}$). Molecular constants obtained are, in $cm^{-1} B^{\prime\prime}=0.25018$, $B^{\prime}= 0.24898$, $D_{k}=0.000056$, and $A^{\prime}=5.095, \zeta_{4}=0.052$, $\nu_{o}=4302.15$ assuming $A^{\prime} = 5.104$. On the high frequency end there are several more superimposed perpendicular bands. Anomalies in the spacing, intensities, and shapes of the Q branches indicate the possible presence of perturbations