THE PURE ROTATIONAL SPECTRA OF CUH AND CUD IN THEIR GROUND-STATES MEASURED BY TUNABLE FAR-INFRARED SPECTROSCOPY

Pure rotational transitions of CuH and CuD within the X(1) Sigma(+) (u psilon = O) state were measured over the ranges J'' = 1 to 10 for CuH and J'' = 2 to 18 for CuD, including both the (CU)-C-63 and Cu-65 isot opes. The rotational parameters B-0,B- D-0, H-0, and L(0) were separat ely determined for each of the four isotopomers by least-squares fitti ng to the observed transitions. For (CUH)-C-65, (CUD)-C-63, and (CUD)- C-65, these parameters are about two orders of magnitude more accurate than those determined by previous workers. Accurate calculated freque ncies of all four isotopomers which will be useful in astronomical stu dies of CuH and CuD are given. (C) 1994 Academic Press, Inc.