Hyperfine interaction and Stark effect in the b~3п-X~1∑~+(0,0) band of copper monofluoride, CuF

摘要

The low-rotational levels of the b~(3)п-X~1∑~+(0,0) band of copper monofluoride, CuF, were recorded field free and in the presence of a static electric field. The field-free spectrum was analyzed to produce a refined set of fine and hyperfine parameters for the b~(3)п(ν=0) state. The permanent electric dipole moment, μ, for the b~(3)п(ν=0) and X~(1)∑~+(ν=0) states were determined to be 2.36(2) and 5.26(2) D, respectively, from the analysis of the observed Stark shifts. The experimental μ values are compared to theoretical predictions. The change in upon excitation and the hyperfine parameters are discussed in terms of the proposed electronic configuration for the b~(3)пand X~(1)∑~+ states. The optical Stark spectroscopy of the A ~(2)п_3/2-X~(2)∑(0,0) subband of YO was also recorded and analyzed to precisely calibrate the electric field strength. The determined μ values are 3.714(5) and 4.542(40) D for the A (2)~п_3/2(ν=0) and X~(2)∑~(ν=0) states, respectively.