Nuclear shielding and magnetic hyperfine structure of hydrogen cyanide

Abstract

A millimeter-wave molecular beam maser has been used to resolve the magnetic hyperfine structure of hydrogen cyanide. The spin-rotation interaction constants have been measured for the three nuclei 14N, 13C, and H. The paramagnetic nuclear shielding factors have been calculated for the three nuclear sites. The spin-rotation constants for 14N in H 12C 14N, for H in H 12C 14N and for 13C in D 13C 14N are + 10.4 kHz, −3.7 kHz, and +15.0 kHz, respectively. The respective paramagnetic shielding factors are −408.98 × 10 −6, −73.40 × 10 −6, and −249.52 × 10 −6.