MICROWAVE OPTICAL DOUBLE RESONANCE SPECTROSCOPY USED AS AN ASSIGNMENT METHOD IN OPTICAL $SPECTROSCOPY^{\ast}$
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Date
1982
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Ohio State University
Abstract
In microwave optical double resonance spectroscopy (MODR) the primary interest is generally in the accurate measurement of the microwave adsorption frequencies. In the work described here though, known microwave transitional frequencies are pumped and the optical transitions frequency of the dye laser is swept. MODR signals are seen in both 3-level and 4-level (collisional) schemes. The method has been applied to $NH_{2}$ on the $1_{10}, J-1/2, \Pi(0, 10, 0) \leftrightarrow u$ transition around $6.3 CHz^{1}$. Double resonance signals were observed for many known ortho levels in $\Pi(0, 10, 0) (N < 7), \Phi(0, 10, 0), \Phi (1, 6, 0)$ etc. Two levels (presumably) responsible for a perturbation to $1_{10}, \Pi(0, 10, 0), (F_{1} and F_{2})$, were located. In the ``u'' manifold of states, $F_{1}$ and $F_{2}$ components of rotational levels with $N-2, K_{a}-2$ and $N-3, K_{a}-2$ were observed. Attempts at a vibronic assignment of the u manifold have so far been unsuccessful. Application of the method to other molecules may be described.
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$^{1}$R.S.Lowe et al, J. Chem. Phys. 70, 3359 (1979), $^{\ast}$Research supported by Research Corporation and the National Science Foundation.