15min:

H. FAN, I. IONESCU, C. MUKARAKATE, C. TAO, M. DESELNICU AND S. A. REID, Department of Chemistry, Marquette University, Milwaukee, WI 53233.

To investigate the ¹⁹F and ¹H nuclear hyperfine structure, Zeeman effect, and spin-orbit interactions in the simplest singlet carbene, we recorded polarization quantum beat spectra (QBS) of ^rR₀(J) lines of the pure bending transitions 2₀ⁿ and combination bands 1₀¹2₀ⁿ and 2₀ⁿ3₀¹ in the A¹A''-X¹A' system of HCF and DCF. The spectra were measured under jet-cooled conditions using a pulsed discharge source, both at zero-field and under application of a weak magnetic field (< 30 G). Analysis yielded the nuclear spin-rotation constants (C_aa) and weak field Lande g_aa factors, from which the a hyperfine constants were estimated. The use of polarization QBS as a probe of spin-orbit interactions in this system will be highlighted.