The hyperfine structure of theustate of NH2, a rovibronic level in the quest;thinsp;2B1manifold lsqb;tentatively assigned as 220,J=3/2, quest;thinsp;2B1(0,13,0)rsqb; has been obtained from an analysis of the strong microwave optical double resonance (MODR) signals which occur between theustate and theJ=1/2 and 3/2 spin components of 110in quest;2thinsp;A1Pgr; (0,10,0). The hyperfine assignment was verified with a new technique that we have chosen to call microwave modulated saturation (MMS) spectroscopy. The similarity of the hyperfine splittings inudue to the H nuclear spin with those of the 220,J=3/2 rotational level of the quest;thinsp;2B1(0,0,0) state supports the assignment ofuto a highly excited vibrational state of quest;thinsp;2B1. The hyperfine splittings due to the14N nucleus were found to be about 1 MHz. These splittings are considerably smaller than those of 220Xthinsp;2B1(0,0,0) (which are about 6ndash;10 MHz). This difference has been attributed to the fact that the hyperfine coupling constants of (0,13,0) must be averaged over a large amplitude bending motion and to the presence of borrowed quest;thinsp;2A1character in theustate.
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