Absolute Intensity of the NH(3) nu(2) Band

Absolute line intensities of NH(3) in the nu(2) band were measured for a number of rovibrational lines using a high-resolution Fourier transform infrared spectrometer. The transition dipole moments calculated from the absolute intensities showed significant and systematic deviations from the usual rotational dependencies predicted from the J, K dependence of the direction-cosine matrix elements. The anomalous rotational dependencies may be explained by vibration-rotation interactions, and the Herman-Wallis-type rotational correction factors for a symmetric top molecule were determined experimentally for the first time in the present study. The self-broadening coefficients were determined as well. Copyright 1999 Academic Press.