Microwave spectroscopy of trapped HD+ determines the v=0, L=3 hyperfine interval as 1,050,804.511(11) kHz, 1.9σ above theory and consistent with scaled ground-state hyperfine data.
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Spectroscopy of the Hyperfine Structure of HD$^+$ in Rotationally Excited States with 10-ppb Uncertainty
Microwave spectroscopy of trapped HD+ determines the v=0, L=3 hyperfine interval as 1,050,804.511(11) kHz, 1.9σ above theory and consistent with scaled ground-state hyperfine data.