MICROWAVE-OPTICAL DOUBLE RESONANCE OF $NH_{2}$
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Date
1976
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Journal ISSN
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Publisher
Ohio State University
Abstract
A number of MODR (microwave-optical double resonance) signals have been observed in the gas phase in the free radical $NH_{2}$. A single mode R6G cw dye laser (Spectra-Physics Model 580A) is used to excite $NH_{2}$ from $\tilde{X}^{2}B_{1}$ (0,0,0) rotational levels to various rovibrational levels of the $\tilde{A}^{2}A_{1}$ state with sufficient laser power to partially saturate the transition. When a microwave field at a transition of the $\tilde{X}$ or $\tilde{A}$ state which is connected to one of the levels involved in the laser excitation is introduced, the fluorescence intensity changes. Magnetic dipole allowed microwave transitions have been observed between the two J components of the $1_{10}, 4_{23},5^{14}, 5_{23}, 6_{25}, 7_{25},$ (all $I_{H} = 0), 4_{22}, 5_{24}, 6_{15}, 6_{24}, 7_{26},$ (all $I_{H} = 1)$ of the $\tilde{X}^{2} B_{1}$ state and of the $2_{11} (I_{H} = 0)$ of the $\tilde{A}^{2} A_{1} (0,10,0) \pi$; state. The electric dipole allowed rotational transition $5_{23}F_{1} - 6_{16} F_{1}$ has also been observed. From the numerous hyperfine components observed in these transitions, it should be possible to obtain accurate values of the electron spin-rotation, Fermi, magnetic dipole, and quadrupole coupling constants of the ground state. This work was partially supported by National Science Foundation Grant No. MPS 71-03046 and Grant No. C-071 from The Robert A. Welch Foundation. G. W. Hills has been the Lindemann Trust Fellow 1974-1976.
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Author Institution: Chemistry and Electrical Engineering Departments, Rice University