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Fig. 1

image

Schematic energy level diagram of the CH2OH radical and selected portions of the experimental spectrum displaying the different components of the r Q0 (10) () transition. The splittings of each rotational level, due to the tunneling effect, the FS, and HFS, are not represented at scale. The arrows represent allowed transitions and are linked to the corresponding experimental lines by dashed lines, in purple for ortho and green for para levels. The presented spectra result from the subtractionof two recordings, without and with a permanent magnet. Each plot has been normalized to the strongest component within the spectral window. The acquisition time varies, depending on the intensity of the components (see text for typical values). For the sake of clarity, the molecular representation of the CH2 OH radical is shown together with a schematic representation of the tunneling of the H1 atom.

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