Step-Wise Laser Excitation of the 4s<i>n</i>f <sup>3</sup>F Rydberg States of Neutral Zinc
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The new experimental results on the effective quantum number and term energies of the highly excited odd-parity 4s4d <sup>3</sup>D<sub>1,2,3</sub>→ 4s<i>n</i>f <sup>3</sup>F<sub>2,3,4</sub> Rydberg transitions of zinc have been presented. The experiment was performed using the three dye lasers simultaneously pumped by the second harmonic (532 nm) of the Q-switched Nd: YAG laser. The new observation include the 4s<i>n</i>f <sup>3</sup>F<sub>3</sub> (12 ≤<i>n</i> ≤ 50) series excited from the 4s4d <sup>3</sup>D<sub>2</sub> intermediate level. In addition, the 4s<i>n</i>f <sup>3</sup>F<sub>2</sub> (12 ≤<i>n</i> ≤ 28) and 4s<i>n</i>f<sup>3</sup>F<sub>4</sub> (12 ≤<i>n</i> ≤ 33) series are observed from the thermally populated 4s4d <sup>3</sup>D<sub>1,3</sub> fine structure components. The ionization potential of zinc has been determined from the unperturbed 4s<i>n</i>f <sup>3</sup>F<sub>3</sub> series as 75769.31 ± 0.15 cm<sup>−1</sup>, which is in excellent agreement with the previously reported value.
