Knowledge Bank

A jet-cooled high resolution infrared spectrum was recorded in a slit-jet apparatus in the asymmetric C-H stretching region of $CH2F2$ between 3002 and $3036cm-1$. Approximately 630 transitions were detected of which about 250 were assigned to the $\nu 6$ band and about 170 were assigned to the $2\nu 2$ overtone at a resolution of $\approx 0.002cm-1$. Seven sub-bands were identified in each vibrational band. The assigned transitions were fitted to a Watson Hamiltonian for an asymmetric rotor ($k=-.932$) in the A-reduced $Ir$ representation. The fitted upper state constants in $cm-1$ for each band are tabulated below. Numbers in parantheses indicate the precision of the fit to two standard deviations in the last digit.[FIGURE]