Multi-step photoionization spectroscopy in uranium between 5900 and 6060 Å using a pulsed hollow-cathode lamp

Rodrigues, N. A. S.; Neri, José Wilson; Schwab, C.; Silveira, Carlos A.B.; Destro, Marcelo Geraldo; Riva, Rudimar; Mirage, A.

doi:10.1088/0953-4075/33/18/316

Cited by 8 publications

(3 citation statements)

References 8 publications

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“…However, owing to the complicated interaction between six optically active electrons, the atomic structure of uranium is much more complicated. Whereas many investigations have been performed so far to identify even-parity AI levels of uranium suitable for triple-resonant RIMS (Coste et al 1982, Manohar et al 1989, Herrmann et al 1991, Rodrigues et al 2000, information available in the literature is still quite limited. In addition, total angular momenta ( J values) assigned for most of the levels have remaining ambiguities.…”

Section: Introductionmentioning

confidence: 99%

Total angular momenta of even-parity autoionizing levels and odd-parity high-lying levels of atomic uranium

Miyabe

Geppert

Oba

et al. 2002

J. Phys. B: At. Mol. Opt. Phys.

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Using three-step resonance ionization spectroscopy, over 200 even-parity autoionizing (AI) levels of atomic uranium, including Rydberg series converging to the second lowest ionic level (6L 11/2o), were observed in the 49 930–51 200 cm−1 energy range. Total angular momenta (J values) of these levels were determined by a polarization combination method as well as a method based on the J-momentum selection rule. Using the AI levels of which J values were determined unambiguously, unique J values were also assigned for about 70 high-lying odd-parity levels. The observed J-dependence on autoionization linewidth is interpreted as being due to a centrifugal potential barrier.

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Section: Introductionmentioning

confidence: 99%

Total angular momenta of even-parity autoionizing levels and odd-parity high-lying levels of atomic uranium

Miyabe

Geppert

Oba

et al. 2002

J. Phys. B: At. Mol. Opt. Phys.

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“…The data is taken from the compilation by Blaise and Wyart [52] (green). More recently, additional levels (orange) were reported for Ac [53,54], Th [55,56,57], Pa [58], U [59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75], Pu [53,75,76], Am [76,77], Es [78], Fm [40,79,80] and No [81,82]. In addition, theoretical predictions are shown (blue) for Ac [83], Fm [84,78], Md [85], No [86,87,88,89,90,91,92] and Lr [93,94,88] In general, the atomic structure of most actinide elements is only partially known due to t...…”

Section: Atomic Structure Of the Heaviest Elementsmentioning

confidence: 99%

Recent progress in laser spectroscopy of the actinides

Block,

Laatiaoui,

Raeder

2020

Preprint

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The interest to perform laser spectroscopy in the heaviest elements arises from the strong impact of relativistic effects, electron correlations and quantum electrodynamics on their atomic structure. Once this atomic structure is well understood, laser spectroscopy also provides access to nuclear properties such as spins, mean square charge radii and electromagnetic moments in a nuclear-model independent way. This is of particular interest for the heaviest actinides around N = 152, a region of shell-stabilized deformed nuclei. The experimental progress of laser spectroscopy in this region benefitted from continuous methodological and technical developments such as the introduction of buffer-gas-stopping techniques that enabled the access to ever more exotic nuclei far-off stability. The key challenges faced in this endeavor are small yields, nuclides with rather short half-lives and the need to search for atomic transitions in a wide spectral range guided by theoretical predictions. This paper describes the basics of the most common experimental methods and discusses selected recent results on the atomic and nuclear properties of the actinides up to nobelium where pioneering experiments were performed at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany.

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“…Considering the wavelength range of the second harmonic of the Ti:Sa laser, the even-parity levels (around 25 000 cm −1 ) and the odd-parity autoionization levels around the ionization potential (IP) of uranium (49958.4 cm −1 [16]) are suitable for a two-step resonant ionization. So far, RIMS [17][18][19][20][21][22][23][24][25] and PIOGS [9,[26][27][28] report some autoionizing levels of uranium. However, most of them are even-parity levels suited for a three-step ionization scheme.…”

Section: Introductionmentioning

confidence: 99%

Odd-parity autoionizing levels of uranium observed by two-color two-step photoionization optogalvanic spectroscopy

Miyabe¹,

Sato²,

Wakaida³

et al. 2021

J. Phys. B: At. Mol. Opt. Phys.

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Two-color two-step photoionization optogalvanic spectroscopy was performed using high-repetition-rate titanium sapphire lasers and a uranium hollow cathode lamp to find the two-step resonance ionization schemes of uranium. Many ionization transitions were observed by exciting uranium atoms in a ground state into five, even parity, excited levels with the first-step laser and by scanning the second-step laser wavelengths. By blocking the first-step laser, single-color, two-photon ionization transitions were also identified. From these results, we have found more than 50 odd-parity autoionizing levels of uranium in the energy, ranging from the ionization potential (49958.4 cm−1) to 51 150 cm−1. The determined energy levels are within ∼±1 cm−1 of previously reported values.

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Multi-step photoionization spectroscopy in uranium between 5900 and 6060 Å using a pulsed hollow-cathode lamp

Cited by 8 publications

References 8 publications

Total angular momenta of even-parity autoionizing levels and odd-parity high-lying levels of atomic uranium

Total angular momenta of even-parity autoionizing levels and odd-parity high-lying levels of atomic uranium

Recent progress in laser spectroscopy of the actinides

Odd-parity autoionizing levels of uranium observed by two-color two-step photoionization optogalvanic spectroscopy

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