Characterization of the field ionization extension for the laser ion source and trap: Measurement of the ionization potential of ytterbium

Kaja, Magdalena; Studer, Dominik; Heinke, Reinhard; Kieck, Tom; Wendt, Klaus

doi:10.1016/j.nimb.2023.165213

Nuclear Instruments and Methods in Physics Research Section B:

2024

DOI: 10.1016/j.nimb.2023.165213

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Characterization of the field ionization extension for the laser ion source and trap: Measurement of the ionization potential of ytterbium

Magdalena Kaja,

Dominik Studer,

Reinhard Heinke

et al.

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2024

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Resonant laser ionization of neptunium: investigation on excitation schemes and the first ionization potential

Kaja,

Studer,

Berg

et al. 2024

Eur. Phys. J. D

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The atomic structure of neptunium (Np) was investigated by two-step resonance ionization spectroscopy. The study involved exploring ground-state transitions as well as following transitions to high-lying states just below the ionization potential (IP) or auto-ionizing states above the IP. That resulted in the identification of two-step ionization schemes, suitable for trace analysis and nuclear structure investigations. The lifetimes of two excited states located at 25,342.48 $$\, \text {cm}^{-1} $$ cm - 1 and 25,277.64 $$\, \text {cm}^{-1} $$ cm - 1 were determined as 230(12) ns and 173(9) ns, respectively. Because of the absence of Rydberg series in wide-ranging spectra recorded, the first IP was determined through the field ionization of high-lying, weakly-bound states using a well-controlled static electric field. By applying the saddle-point model, an IP value of 50,535.54(15) cm$$^{-1}$$ - 1 [6.265608(19) eV] was derived. This value agrees with the current literature value of 50,535(2) cm$$^{-1}$$ - 1 , while providing a more than ten times higher precision. Graphic abstract

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Resonant laser ionization of neptunium: investigation on excitation schemes and the first ionization potential

Kaja,

Studer,

Berg

et al. 2024

Eur. Phys. J. D

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show abstract

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Characterization of the field ionization extension for the laser ion source and trap: Measurement of the ionization potential of ytterbium

Cited by 1 publication

References 25 publications

Resonant laser ionization of neptunium: investigation on excitation schemes and the first ionization potential

Resonant laser ionization of neptunium: investigation on excitation schemes and the first ionization potential

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