Electronic level structure of Th+ in the range of the Th 229m isomer energy

verfasst von: D. M. Meier, J. Thielking, P. Głowacki, M. V. Okhapkin, R. A. Müller, A. Surzhykov, E. Peik
Abstract: Using resonant two-step laser excitation of trapped Th+232 ions, we observe 166 previously unknown energy levels of even parity within the energy range from 7.8 to 9.8 eV and angular momenta from J=1/2 to 7/2. We also classify the high-lying levels observed in our earlier experiments by the total angular momentum and perform multiconfiguration Dirac-Fock calculations to compare their results with the observed level density. The observed levels can be relevant for the excitation or decay of the Th229m isomeric nuclear state which lies in this energy range. The high density of electronic levels promises a strongly enhanced electronic bridge excitation of the isomer in Th+229.
Externe Organisation(en): Physikalisch-Technische Bundesanstalt (PTB)
Poznan University of Technology
Technische Universität Braunschweig
Typ: Artikel
Journal: Physical Review A
Band: 99
ISSN: 2469-9926
Publikationsdatum: 29.05.2019
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Atom- und Molekularphysik sowie Optik
Elektronische Version(en): https://doi.org/10.1103/PhysRevA.99.052514 (Zugang: Unbekannt)

BibTeX

@article{ba878f0991364697b6551d6e3d50d499,
title = "Electronic level structure of Th+ in the range of the Th 229m isomer energy",
abstract = "Using resonant two-step laser excitation of trapped Th+232 ions, we observe 166 previously unknown energy levels of even parity within the energy range from 7.8 to 9.8 eV and angular momenta from J=1/2 to 7/2. We also classify the high-lying levels observed in our earlier experiments by the total angular momentum and perform multiconfiguration Dirac-Fock calculations to compare their results with the observed level density. The observed levels can be relevant for the excitation or decay of the Th229m isomeric nuclear state which lies in this energy range. The high density of electronic levels promises a strongly enhanced electronic bridge excitation of the isomer in Th+229.",
author = "Meier, {D. M.} and J. Thielking and P. G{\l}owacki and Okhapkin, {M. V.} and M{\"u}ller, {R. A.} and A. Surzhykov and E. Peik",
note = "Funding information: We thank O. A. Herrera-Sancho and K. Zimmermann for contributions to the experimental setup and S. Klein for assistance in the experiment. We furthermore thank T. Leder, M. Menzel, B. Lipphardt, and A. Hoppmann for providing expert technical support. We acknowledge financial support from the European Union's Horizon 2020 Research and Innovation Programme under Grant Agreement No. 664732 (nuClock) and from Deutsche Forschungsgemeinschaft (DFG) through CRC 1227 (DQ-mat, Project No. B04).",
year = "2019",
month = may,
day = "29",
doi = "10.1103/PhysRevA.99.052514",
language = "English",
volume = "99",
journal = "Physical Review A",
issn = "2469-9926",
publisher = "American Physical Society",
number = "5",
}