The permanent electric dipole moments of chromium and vanadium mononitride: CrN and VN

The Pe(1), F″=2.5 branch feature of the (0,0) D 3Π0e–X 3Δ1 band system of VN51 was recorded as a function of an applied static electric field. The resultant Stark splitting and shifts were analyzed giving values of 3.07(7) D and 6.1(4) D for the X 3Δ1 and D 3Π0e states, respectively, for the magnitude of the permanent electric dipole moment, |μ|. Similarly, the Ree(0.5) branch feature of the (0,0) A 4Π3/2–X 4Σ− band system of CrN52 was recorded as a function of an applied static electric field and analyzed to produce |μ| values of 2.31(4) D and 5.42(2) D for the X 4Σ− and A 4Π3/2 states, respectively. In order to facilitate the dipole moment determinations for CrN52 it was necessary to record and analyze the field free spectrum of the (0,0) A 4Π3/2–X 4Σ− subband system. A comparison of the dipole moments for the first row monoxides and mononitrides is made and trends are discussed with reference to a molecular orbital correlation scheme.