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

The P-e(1), F "=2.5 branch feature of the (0,0) D (3)Pi(0e)-X (3)Delta(1) band system of (VN)-V-51 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 (3)Delta(1) and D (3)Pi(0e) states, respectively, for the magnitude of the permanent electric dipole moment, \mu\ Similarly, the R-ee(0.5) branch feature of the (0,0) A (4)Pi(3/2)-X (4)Sigma(-) band system of (CrN)-Cr-52 was recorded as a function of an applied static electric field and analyzed to produce \mu\ values of 2.31(4) D and 5.42(2) D for the X (4)Sigma(-) and A (4)Pi(3/2) states, respectively. In order to facilitate the dipole moment determinations for (CrN)-Cr-52 it was necessary to record and analyze the field free spectrum of the (0,0) A (4)Pi(3/2)-X (4)Sigma(-)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. (C) 1999 American Institute of Physics. [S0021-9606(99)03901-X].