Metastable states of 
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 observed in a cryogenic storage ring

Müll, Damian; Grussie, Florian; Blaum, Klaus; George, Sebastian; Göck, Jürgen; Grieser, M.; Hahn, R. von; Harman, Z.; Kálosi, Ábel; Keitel, Christoph H.; Krantz, Claude; Lyu, Chunhai; Novotný, Oldřich; Nuesslein, F.; Paul, Daniel; Schmidt, Viviane C.; Singh, Samarendra P.; Kumar, Sunil; Urbain, Xavier; Wolf, A.; Kreckel, H.

doi:10.1103/physreva.104.032811

Cited by 9 publications

(4 citation statements)

References 45 publications

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“…By applying selective laser photodetachment, the long-lived rotationally excited states of the OH − ion were successfully depleted, further increasing the ground-state population for an ion beam stored in an electrostatic cryogenic storage ring 37 . A similar technique was used for atomic negative ions in a recent study by Müll et al, where an ion beam purely in the 4 S 3/2 ground state of Si − was produced by selectively photodetaching excited state ions 29 .…”

Section: Resultsmentioning

confidence: 99%

“…The cold environment and good vacuum provide very long storage times for atomic and molecular ions. For negative ions, these storage rings have been used to measure the lifetimes of long-lived metastable excited states 27 – 29 . In this work, we present a method for precision measurements of electron affinities where we conduct the photodetachment spectroscopy in the Double Electrostatic Ion Ring ExpEriment (DESIREE) 23 , 24 .…”

Section: Introductionmentioning

confidence: 99%

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High-precision electron affinity of oxygen

et al. 2022

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Negative ions are important in many areas of science and technology, e.g., in interstellar chemistry, for accelerator-based radionuclide dating, and in anti-matter research. They are unique quantum systems where electron-correlation effects govern their properties. Atomic anions are loosely bound systems, which with very few exceptions lack optically allowed transitions. This limits prospects for high-resolution spectroscopy, and related negative-ion detection methods. Here, we present a method to measure negative ion binding energies with an order of magnitude higher precision than what has been possible before. By laser-manipulation of quantum-state populations, we are able to strongly reduce the background from photodetachment of excited states using a cryogenic electrostatic ion-beam storage ring where keV ion beams can circulate for up to hours. The method is applicable to negative ions in general and here we report an electron affinity of 1.461 112 972(87) eV for 16O.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-precision electron affinity of oxygen

et al. 2022

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“…Silicon anions were produced by a Cs-sputter ion source [25] with a silicon single crystal as a sputter target and a sputter potential of about 2 kV. Si − is known to posses long-lived metastable levels with excitation energies of 1.36 eV and 0.86 eV and lifetimes of 22 s and more than 5.7 h, respectively [26]. However, Si − ions produced by a Cs-sputter ion source in an earlier experiment were found to be exclusively in their 1s 2 2s 2 2p 6 3s 2 3p 3 4 S 3/2 ground level [27].…”

Section: Methodsmentioning

confidence: 99%

Multiple photodetachment of silicon anions via K -shell excitation and ionization

Perry‐Sassmannshausen

Buhr

Martins

et al. 2021

Phys. Rev. A

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Experimental cross sections for m-fold photodetachment (m = 3 − 6) of silicon anions via Kshell excitation and ionization were measured in the photon-energy range of 1830-1900 eV using the photon-ion merged-beams technique at a synchrotron light source. All cross sections exhibit a threshold behavior that is masked by pre-threshold resonances associated with the excitation of a 1s electron to higher, either partly occupied or unoccupied atomic subshells. Results from multiconfiguration Dirac-Fock (MCDF) calculations agree with the experimentally derived cross sections for photo-absorption if small energy shifts are applied to the calculated resonance positions and detachment thresholds. Moreover, a systematic approach is applied for modeling the deexcitation cascades that set in after the initial creation of a K-shell hole. The resulting product charge-state distributions compare well with the measured ones for direct K-shell detachment but less well for resonant K-shell excitation. The present results are potentially useful for identifying silicon anions in cold plasmas such as interstellar gas clouds.

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“…Electrostatic ion storage devices offer a powerful new technology to experimentally explore the interactions of atomic, molecular and cluster ion species with neutral targets, 1,2 electrons, 1,3,4 black-body radiation 5,6 and with various laser fields. 7–15 The detailed understanding of the interactions and time-evolution of ionic species is important for a fundamental understanding of the underlying quantum mechanical many-electron and many-atom dynamics, 16,17 as well as for application to studies of the chemical evolution of a broad range of partly ionized interstellar-medium, 18–22 planetary, atmospheric and man-made environments. 23–25 Electrostatic trapping of well-defined fast ion beams allows not only for extended interrogation times, but also characterization and isolation of ions of specific mass over charge ratios.…”

Section: Introductionmentioning

confidence: 99%