title: Fourier Transform Far-Infrared Spectroscopy of the NH2, NHD, and ND2 Radicals
abstract: The gas-phase far-infrared absorption spectra of the NH2, NHD, and ND2 radicals have been observed in the 51-366 cm-1 region with a high-resolution Fourier transform spectrometer. The NH2 radical was generated in a multiple-traversal absorption cell by a dc discharge in an NH3 and Ar mixture. A discharge in an NH3, D2, and Ar mixture was used for production of NHD and ND2. The observed spectra with a resolved fine structure were analyzed by Watson's A-reduced Hamiltonian including a spin-rotation interaction term. The rotational and spin-rotation constants were determined to higher order. In the same experiment of NH2, the rotational spectrum of the NH radical was also observed. From the rotational constants, inertia defect Delta and r0 structure were determined, as follows, with one standard deviation in parentheses:NH2ND2r0 (A)1.0245(37)1.0239(19)theta0 (degree)103.34(51)103.33(27)Deltaobs (amuA2)0.049561(4)0.06770(4);Dgr;calc (amuA2)0.0476530.066566 Copyright 1997Academic Press
authors.affiliation: Department of Astronomical Science, The Graduate University for Advanced Studies, Minamimaki, Minamisaku, Nagano, 384-13, Japan
authors.initials: I
authors.lastname: Morino
authors.initials: K
authors.lastname: Kawaguchi