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HYPERFINE STRUCTURE IN THE PURE ROTATIONAL SPECTRUM OF ²⁰⁸Pb³⁵Cl.

CHRISTOPHER T. DEWBERRY, GARRY S. GRUBBS II, KERRY C. ETCHISON AND STEPHEN A. COOKE, DEPARTMENT OF CHEMISTRY, UNIVERSITY OF NORTH TEXAS, 1155 UNION CIRCLE #305070, DENTON, TX 76203-5017, U.S.A.

Initially in our laboratory the pure rotational spectrum of the title molecule was studied using a Balle-Flygare Fourier transform microwave spectrometer. Analysis was troublesome and so the spectrum was remeasured using a chirped pulse Fourier transform microwave (CP-FTMW) spectrometer. The correct intensity aspect of the CP-FTMW experiment allowed succesful quantum number assignments for the hyperfine structure for the correct isotopologue. Spectroscopic constants have been obtained from a fit to a data set consisting of our measurements combined with those of a prior study on the X₂² _\frac32 rightarrow X₁² _\frac12 fine structure transitions.