Electric quadrupole coupling of the nuclear spin with the rotation of a polar diatomic molecule in an external electric field

Abstract

Formulas are given that serve to de termine the hyperfine s pectrum of a roLatilig molecule 111 various cases, depend ing o n the external field strength and on the rotational quantum number. A complete calculation is carried out for a ca e in which only one of the nuclei has. a quadrupole moment, the molecule is in a rotational state (1: 1 or 0), and the interaction between the fi eld and the molecular dipole is comparab le to t hat between the dipole and th e nuclear spin.