Abstract
We have measured the energy values of the n 2S 1 2 (9⩽n⩽46) and n 2D 5 2 , 3 2 (7⩽n⩽46) states of 39K I by Doppler-free two-photon spectroscopy with a thermionic detector. The laser wavelengths of the two-photon transitions were determined with an evacuated wavemeter, whose absolute accuracy is about 2×10 -8. By applying the extended Rydberg-Ritz formula to the n 2S 1 2 - and n 2D 5 2 , 3 2 energy data, the ionization limit of 39K I was found to be 35009.8140±0.0007 cm -1.
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