Fig. 1
Lowest rotational energy levels of CH. The relevant transitions are labelled with their transitions marked using arrows, with the HFS splitting of the ground-state energy level of CH as well as the rotational transition from the N, J = 2, 3∕2 → 1, 1∕2 highlighted in magenta and blue, respectively. We note that the Λ-doublet and HFS splitting level separations are not drawn to scale.
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