期刊
HYPERFINE INTERACTIONS
卷 238, 期 -, 页码 -出版社
SPRINGER
DOI: 10.1007/s10751-016-1384-4
关键词
Resonance ionization spectroscopy; Ionization potential; Ionization scheme development; Dysprosium
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 three-step resonance ionization scheme. Moreover, an extensive analysis of the even-parity 6sns-and 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.
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