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This paper reports for the first time continuous-wave, high-resolution, all-optical triple resonance spectroscopy. Using this technique, one can overcome the spin forbiddeness nature of a singlet-triplet transition and consequently unperturbed triplet rovibronic levels can be reached from a singlet ground state. This technique also facilitates state-selective population transfer to highly excited vibrational levels, both in the ground state and in excited states.
Lyyra et al. (Mon,) studied this question.