Knowledge Bank

The sign and magnitude of Land'{e} gp factors for single $NO2$ rovibronic (J = 3/2) eigenstates in the $15cm-1$ region below dissociation threshold $(D0=25,128.57cm-1)$ were investigated using Zeeman quantum-beat spectroscopy. The derived Land'{e} gp factors exhibit pronounced fluctuations about an average much smaller than expected in the absence of rovibronic perturbations, which destroy the goodness of the N and K quantum numbers and the $J=N+S$ coupling scheme. The $F=J+I$ coupling scheme was found to be valid near $D0$ to within the uncertainty of our measurements, and the average Land'{e} $gF$ factors near dissociation threshold are in good agreement with those calculated under the assumption of complete rovibronic mixing. Our findings do not provide evidence for the participation of repulsive quartet states near dissociation threshold.