Fig. 2: Zeeman components of the rovibrational transition measured under nominal operating conditions.
The three Zeeman components \({f}_{{b}_{2}}\), \({f}_{{b}_{1}}\) and \({f}_{{a}_{1}}\) (from left to right) are shown with the same colours as in Fig. 1b. The labels in the panels indicate the quantum numbers, \((F,{m}_{F})\to ({F}^{{\prime} },{m}_{{F}^{{\prime} }})\). The component \({f}_{{a}_{1}}\) (light blue) is split into a doublet by the Autler–Townes (AT) effect (Methods). The deperturbed frequency and uncertainty range of this component are indicated by black full and dashed lines, respectively. We also assume that the Zeeman components of the other spin component (red and green) are AT-split, but did not measure the full AT doublets. The laser frequency detuning is given relative to different reference values in the top and the bottom abscissae. Top, the reference values are the deperturbed transition frequencies of the respective spin component \({f}_{a}^{({\rm{expt}})}\) and \({f}_{b}^{({\rm{e}}{\rm{x}}{\rm{p}}{\rm{t}})}\). Bottom, the reference value is the adjusted spin-averaged transition frequency \({f}_{\text{spin-avg}}^{({\rm{expt}})}\). The coloured curves are guides to the eye. For display purposes, the data are divided into bins, and the average value of each bin is shown. For an individual component, the bin size is kept constant, but it may vary between different components. The vertical error bars are the standard error of the mean in the bin. The horizontal error bars are due to the uncertainty of the frequency of the spectroscopy wave and are smaller than the size of a data point (Methods).
