Institution: | 1 Molecular Physics Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, U.S.A. b LPMA-batiment 350, Universite de Paris-Sud, 91405, Orsay Cedex, France |
Abstract: | Intensities have been measured for individual transitions in the Q and R branches of the ν1 band of NH3 using a difference-frequency laser spectrometer. The data yield an integrated band strength of S0v=219.36±1.03 cm-2/MPa at 297 K, corresponding to a transition moment of μv = 8.535(20) × 10-32 C·m, and a Herman-Wallis correction factor, (1 + jm)2, where j = 0.0209(20). The intensities of a few lines for K 7 were noticeably perturbed by a perpendicular Coriolis interaction with 2ν4 (E, L = 2), so were excluded from the fit. A small sample of ν3 band lines occurring in the ν1 band scans also yields a rough estimate of the ν3 band intensity with evident irregular perturbations. |