Laser and millimeter-wave spectroscopy of Rydberg transitions in 39K yields an ionization threshold of 35009.8139710(22) cm^{-1} and refined quantum defects for s, p, d, f, and g series, plus a ground-state hyperfine splitting of 461.719700(5) MHz.
Bockasten, Phys
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Precision measurement of the ionization energy and quantum defects of 39K I
Laser and millimeter-wave spectroscopy of Rydberg transitions in 39K yields an ionization threshold of 35009.8139710(22) cm^{-1} and refined quantum defects for s, p, d, f, and g series, plus a ground-state hyperfine splitting of 461.719700(5) MHz.