Resonance ionization spectroscopy in dysprosium
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Resonance ionization spectroscopy in dysprosium Excitation scheme development and re-determination of the first ionization potential D. Studer1 · P. Dyrauf1 · P. Naubereit1 · R. Heinke1 · K. Wendt1
© Springer International Publishing Switzerland 2016
Abstract We report on resonance ionization spectroscopy (RIS) of high-lying energy levels in dysprosium. We developed efficient excitation schemes and re-determined the first ionization potential (IP) via analysis of Rydberg convergences. For this purpose both two- and three-step excitation ladders were investigated. An overall ionization efficiency of 25(4) % could be demonstrated in the RISIKO mass separator of Mainz University, using a threestep resonance ionization scheme. Moreover, an extensive analysis of the even-parity 6snsand 6snd-Rydberg-series convergences, measured via two-step excitation was performed. To account for strong perturbations in the observed s-series, the approach of multichannel quantum defect theory (MQDT) was applied. Considering all individual series limits we extracted an IP-value of 47901.76(5) cm−1 , which agrees with the current literature value of 47901.7(6) cm−1 , but is one order of magnitude more precise. Keywords Resonance ionization spectroscopy · Ionization potential · Ionization scheme development · Dysprosium
1 Introduction Resonance ionization spectroscopy has been proven to be a most versatile experimental technique with a wide range of applications in both atomic and nuclear research. The stepwise excitation and ionization using strong optical dipole transitions provides excellent
This article is part of the Topical Collection on Proceedings of the 10th International Workshop on Application of Lasers and Storage Devices in Atomic Nuclei Research: “Recent Achievements and Future Prospects” (LASER 2016), Pozna´n, Poland, 16–19 May 2016 Edited by Krassimira Marinova, Magdalena Kowalska and Zdzislaw Błaszczak D. Studer
[email protected] 1
Institut f¨ur Physik, Johannes Gutenberg-Universit¨at Mainz, 55099 Mainz, Germany
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elemental selectivity by utilizing each elements unique atomic structure, while being highly efficient at the same time. In particular on-line mass separators, such as ISOLDE at CERN and others, benefit from laser ion sources and related spectroscopic work. The production of high-purity radioactive ion beams (RIBs) is achieved by applying resonance ionization in combination with mass spectrometers (RIMS) and enables research on shortest lived exotic radioisotopes far off stability [1, 2]. In addition to fundamental research, practical applications of RIMS span from ultratrace analysis [3] to the production of medically relevant radioisotopes, where highest purity against any radioactive interference is mandatory to meet ethical standards [4]. While laser ion sources have undergone constant development in the last decades, their efficiency is finally determined by the sequence of transitions used for resonant ionization process. Optimum ionization schem
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