ANALYSIS OF THE HYPERFINE STRUCTURE IN THE [18.9] 4 - X 4 TRANSITION OF COBALT MONOFLUORIDE.
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Date
1995
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Publisher
Ohio State University
Abstract
The electronic spectroscopy of the cobalt monofluoride molecule has been studied using a pulsed molecular beam apparatus. The molecules were produced by chemical reaction of laser-ablated cobalt atoms in a pulsed helium expansion seeded with $SF_{6}$. Low resolution $(\sim 0.05 cm^{-1} bandwidth)$ results for this molecule have recently been $published^{1}$ and we now report on our first high-resolution $(\sim 0.006 cm^{-1} FWHM)$ findings. Two bands were probed at sub-Doppler resolution using a single mode dye laser. Hyperfine structure arising from the cobalt nuclear spin, $I = 7/2$, was well resolved. The most intense band, centered at 529 nm, furnished about 40 measurable P, Q, and R lines yielding both $\Delta F = \Delta J$ and $\Delta F \neq \Delta J$ hyperfine transitions. Unfortunately, the second band accessible with our cw dye laser was too weak to allow the hyperfine transitions to be measured. A non-linear least-squares fit of some 500 hyperfine lines from the 529 nm band furnished effective $T_{0}, B$, and D values for the upper ${^{3}}\Phi$ state and an effective B value for the lower ${^{3}}\Phi$ state, as well as a hyperfine `h' parameter for each state. We will also report on calibrated low-resolution measurements of several other electronic transitions in the region 450 to 500 nm.
Description
1. A. G. Adam, L.P. Fraser, W.D. Hamilton, and M.C. Steeves, Chem. Phys. Lett. 230, 82 (1994).
Author Institution: University of New Brunswick, Fredericton, N.B., Canada E3B 6E2
Author Institution: University of New Brunswick, Fredericton, N.B., Canada E3B 6E2