Abstract
We report the first measurements of oscillator strengths for 4s 2S1/2 → np 2P1/2,3/2 (19 ⩽ n ⩽ 57) Rydberg transitions in atomic sodium using a thermionic diode ion detector in conjunction with an Nd:YAG pumped dye laser system. The f-values have been calibrated with the measured photoionization cross-section from the 4s 2S1/2 excited state at the first ionization threshold as 0.65(0.10) Mb. The binding energy of the 4s 2S1/2 level is determined as 15 709.444(8) cm−1 by employing the Rydberg relation to the observed np 2P1/2,3/2 Rydberg series. Addition of the binding energy to the known energy of the 4s 2S1/2 level yields the first ionization potential of sodium as 41 449.44(1) cm−1, which is in excellent agreement with the recognized value.
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