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r): CONTINUED STUDIES OF THE 3d TRANSITION METAL SULFIDES.
R. L. PULLIAM, A. J. HIGGINS AND L. M. ZIURYS, Department of Chemistry, Department of Astronomy, Steward Observatory, University of Arizona, Tucson, AZ 85721.
The pure rotational spectrum of CrS has been measured in the ground X5
r state using gas-phase direct absorption methods in the frequency range of 280-405 GHz. The molecule was created by the reaction of chromium vapor, sublimed in a Broida oven, with hydrogen sulfide gas. All five spin components were observed in eleven rotational transitions, and lambda-doubling splitting were resolved in the
= 0, 1 and 2 ladders. The data were fit with a Hund’s case(a) Hamiltonian and rotational, spin-orbit, spin-spin, and lambda-doubling constants have been established. A bond length of 2.0781 Å was derived from the data. Using the lambda-doubling parameters, the energy difference between the ground X5
and excited 5
state was estimated to be 1400 cm -1.