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We report the first observation of a resonance induced by a submillimeter wave between circular atomic Rydberg states of maximum angular momentum (n=25, m₋=24=24, m₋=23 transition in lithium). This experiment is the first step towards a possible measurement of the Rydberg constant directly in frequency units. The Stark shift of the resonance has also been studied and its quadratic character put in evidence.
Liang et al. (Sun,) studied this question.