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We report a precise measurement of hyperfine structure in the $ \rm{3\,S_{1/2}} $ state of the odd isotope of Li, namely $ \rm {^7Li} $. The stateis excited from the ground $ \rm {2\,S_{1/2}} $ state (which has the sameparity) using two single-photon transitions via the intermediate $ \rm{2\,P_{3/2}} $ state. The value of the hyperfine constant we measure is $ A =93.095(52)$ MHz, which resolves two discrepant values reported in theliterature measured using other techniques. Our value is also consistent withtheoretical calculations.

Precise measurement of hyperfine structure in the $ \rm {3\,S_{1/2}} $ state of $ \rm{^7Li} $