Abstract
High-resolution resonance ionization spectroscopy has been utilized to determine a precise ionization potential of Ca. Three-step resonance excitation with single-mode extended-cavity diode lasers populates long and unperturbed Rydberg series of 4snp ( 1 P 1 ) and 4snf ( 1 F 3 ) states in the range of n =20–150. Using an extended Ritz formula for quantum defects, the series convergence limit has been determined to be 49305.9240(20) cm -1 with the accuracy improved one order of magnitude higher than previously reported ones.
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