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The n-photon rotational line strength (RLS) in diatomic molecules is studied for transitions between two states which both belong to Hund's case (a). The expression of the n-photon RLS is given for n identical photons linearly polarized and n identical photons circularly polarized, in the Born-Oppenheimer approximation and neglecting rotational contributions to the energies of the intermediate states. The selection rules are also given.
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