The hyperfine interaction in the odd isotope of ytterbium fluoride, 171YbF

Abstract The pure rotational spectrum of a minor isotopologue of ytterbium fluoride, 171 YbF, in the X 2 Σ + ( v  = 0) state has been recorded using Fourier transform microwave (FTMW) spectroscopy and pump/probe microwave optical double resonance (PPMODR) spectroscopy. The pure rotational spectra and precisely measured splittings in the (0, 0) A 2 Π 1/2  ←  X 2 Σ + band were analyzed to produce an improved set of fine and magnetic hyperfine parameters for the X 2 Σ + ( v =  0) state of 171 YbF. A comparison with theoretical predictions is made.