Abstract

Pure rotational spectra of transition metal hydroxides have been reported. Millimeter wave spectra of CuOH and AgOH were recorded in a direct current discharge absorption cell in the range of 200–390 GHz. The spectra of both molecules correspond to that of a near prolate asymmetric top and only a-type R branch transitions were observed. The rotational and centrifugal distortion constants of CuOH and AgOH were precisely determined. Centrifugal distortion terms up to N2Nz10 were required to fit the observed line frequencies of CuOH63. A preliminary analysis showed that AgOH is also strongly bent like CuOH with a bond angle smaller by about 2°.

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