ASSIGNMENT OF SEVERAL NEW TRANSITIONS IN $NH_{2}$ BY MODR

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1978

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Ohio State University

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Using the technique of microwave optical double resonance (MODR) with dye laser excited fluorescence detection, several excited state transitions to the previously uncharacterized $2_{20}$ vibronic level of $NH_{2}$ have been measured and both the proton and nitrogen hyperfine splittings have been resolved. These electric dipole-allowed transitions (tentatively assigned as) $\widetilde{X}^{2} B_{1} (0,12,0), 2_{20} \leftarrow \widetilde{A} ^{2}A_{1} \Pi(0,10,0), 1_{10}, J = 3/2 \leftarrow 1/2$ are in the region of 6.3 GHz. Together with an earlier determination of the hyperfine structure in the $1_{10}, J = 3/2$ and J = 1/2 levels, these results have allowed us to assign the hyperfine splitting pattern of the $2_{20}$ level. This provides new information, both on the hyperfine constants of a highly excited vibrational state of $NH_{2}$, and on the $^{2} A_{1}$ level of this radical.

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Author Institution: Department of Chemistry, Rice University

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