Abstract
A tentative anharmonic force field, including quadratic, cubic
and quartic terms, has been determined for HNC. The force
field is based on observed vibration-rotation data for
HNC and DNC, a previous ab initio SCF calculation of
the quadratic and cubic force constants, and the anharmonic
force fields determined earlier for HCN and
HCP. Using $\alpha$ constants calculated from the force
field, the zero-point rotational constants $B_0$ for the eight
stable isotopic species have been converted to $B_e$, and
hence an improved equilibrium structure has been derived. The
equilibrium bond lengths are found to be
$r_e(HN)=0.9940(8)$~\AA\ and
$r_e(NC)=1.1689(2)$~\AA.
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