Knowledge Bank

Absolute intensities have been measured, using a diode laser spectrometer, for several vibration-rotation lines in the $\nu 4$ fundamental of methane. The data have been analyzed, with the inclusion of Coriolis interactions, to obtain a transition moment of $(0.0508\pm 0.0015)\times 10-18$ esu cm. This work appears to resolve some earlier difficulties in interpreting measurements and calculations of intensities in $\nu 4$ of $CH4$.