Abstract
The a- and c-type rotational transitions of difluorocyanamide, F 2NCN, in the spectral ranges from 26–40 and 100–300 GHz have been measured and assigned. The quadrupole hyperfine structure induced by the two non-equivalent nitrogen nuclei has been analyzed and a centrifugal distortion analysis using Watson's A-reduced Hamiltonian in the I r-representation has been carried out. Rotational and centrifugal distortion constants up to the sixth order have been determined for the ground vibrational state. The rotational constants obtained are A = 10 129.4808(15) MHz, B = 4462.14783(26) MHz, C = 3 276.86967(29) MHz; the nuclear quadrupole coupling constants were determined to be χ aa = 1.00(7) MHz and χ bb –χ cc = 12.27(7) MHz for the amide nitrogen nucleus, and χ aa = −3.71(7) MHz and χ bb –χ cc = 1.30(6) MHz for the cyanide nitrogen nucleus.
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