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(Left) Spectra obtained at low- and high-laser power for dyad-1. (Right) Difference spectra obtained to take into account (i) that ν1 from the ground state should be negative (Bottom), (ii) that ν1 from the ground state should be cancelled to measure precisely the frequency of the ν1a of the triplet (Middle), and (iii) letting some intensity for the presence of the ν1b of the triplet state (Top).
