Spectroscopy of the np and nf even-parity Rydberg series in xenon by two-photon excitation

This is the authors' abstract. We don't add key points for this paper.

The energies of the np[1/2]0, np[3/2]2, np[5/2]2, nf[3/2]2, and nf[5/2]2 Rydberg states in Xe are measured within +0.3/−0.5 cm−1 from n = 12 to n = 49. The Rydberg states are excited by nonresonant two-photon absorption and detected by dc field ionization or infrared photoionization. We determine the ionization limit and the quantum defects for the different series involved.