Rotational spectroscopy of the SrNH2 and SrND2 radicals ((X)over-tilde(2)A(1))

The pure rotational spectrum of the SrNH2 radical in its (X) over tilde (2) A(1) state has been recorded using sub-millimeter direct absorption techniq ues in the range 225-540 GHz. Measurements of SrND2 have also been conducte d. Both molecules were produced by the reaction of metal vapor and NH3 or N D3. Fourteen and fifteen rotational transitions were recorded for SrNH2 and SrND2, respectively. Asymmetry doublets for K-a = 0 through 5 or 6, as wel l as fine structure splittings, were observed in every transition. From the se data, spectroscopic constants have been determined, as well as an r(0)-s tructure. This study provides additional evidence that SrNH2 is planar with ionic bonding. (C) 2000 Elsevier Science B.V. All rights reserved.