Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 34: Precision spectroscopy of atoms and ions II (with Q)

A 34.2: Vortrag

Donnerstag, 3. März 2016, 11:30–11:45, f428

RIS studies of high-lying energy levels in erbium for the determination of the first ionization potential — •Dominik Studer¹, Patrick Dyrauf¹, Pascal Naubereit¹, Matsui Daiki², and Klaus Wendt¹ — ¹Institute of Physics, Johannes Gutenberg-University Mainz — ²Department of Physics, Nagoya University

For most lanthanides, the extremely rich atomic spectrum is not completely known and proper level identification is still a challenge. Theoretical approaches are often incapable to deconvolute the stuffed structures, as obtained from atomic spectroscopy in particular for higher excitation energies, due to missing level assignments. In addition, precise and meaningful experimental data is still lacking in that range. Correspondingly, the ionization potentials of a number of lanthanide elements were determined with an insufficient precision of a few cm⁻¹. Here, we report on two-step resonance ionization spectroscopy in the spectrum of erbium. The accurate measurement of energy positions of a multitude of high-lying Rydberg-states in the range of principal quantum number 15 < n < 60 was performed. To account for perturbations of the observed Rydberg-series from interloper states, an extension of the conventional Rydberg-Ritz formalism is required for a correct description of the observed s, d and g series. It allows for a determination of the ionization potential with a precision of better than 0,1 cm⁻¹. This talk presents the spectroscopic data and discusses the analysis of the Rydberg-series comparing two different approaches for the evaluation of perturbed Rydberg-series.