Photoionization of metastable heliumlike 
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Müller, A.; Lindroth, Eva; Bari, Sadia; Borovik, A.; Hillenbrand, P.‐M.; Holste, K.; Indelicato, P.; Kilcoyne, A. L. D.; Klumpp, S.; Martins, M.; Viefhaus, Jens; Wilhelm, Patrick; Schippers, S.

doi:10.1103/physreva.98.033416

Cited by 41 publications

(44 citation statements)

References 109 publications

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“…Two permanent experimental installations were used, namely, the PIPE (Photon-Ion Spectrometer at PETRA III) endstation [30,31] of beamline P04 [32] and the IPB (Ion-Photon Beamline) endstation [33] of beamline 10.0.1. at the ALS. Several of the most recent publications of the present collaboration on photoprocesses of ions studied at the endstations at the ALS [13,[34][35][36][37] and at PETRA III [38][39][40][41][42][43] illustrate the experimental capabilities and the latest developments.…”

Section: Methodsmentioning

confidence: 95%

Photoionization and photofragmentation of singly charged positive and negative Sc3N@C80 endohedral fullerene ions

et al. 2019

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Section: Methodsmentioning

confidence: 95%

Photoionization and photofragmentation of singly charged positive and negative Sc3N@C80 endohedral fullerene ions

et al. 2019

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“…Richter et al (2004) do not provide any information on the calibration uncertainty of the Fe 0 energy scale. In our experiments, absorption features in gases were used as reference standards as discussed in considerable detail by Müller et al (2017Müller et al ( , 2018. Lee et al (2009) refer their data to theoretically calculated values for the iron 2p absorption edges as provided by the computer code of Brennan & Cowan (1992), which uses theoretical absorption data from Cromer & Liberman (1970, 1981.…”

Section: Comparison With Other Forms Of Ironmentioning

confidence: 99%

Near L-edge Single and Multiple Photoionization of Doubly Charged Iron Ions

Schippers

Martins

Beerwerth³

et al. 2021

ApJ

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Using the photon-ion merged-beams technique at a synchrotron light source, we have measured relative cross sections for single and up to five-fold photoionization of Fe 2+ ions in the energy range of 690-920eV. This range contains thresholds and resonances associated with ionization and excitation of 2p and 2s electrons. Calculations were performed to simulate the total absorption spectra. The theoretical results show very good agreement with the experimental data, if overall energy shifts of up to 2.5eV are applied to the calculated resonance positions and assumptions are made about the initial experimental population of the various levels of the Fe 2+ ([Ar]3d 6 ) ground configuration. Furthermore, we performed extensive calculations of the Auger cascades that result when an electron is removed from the 2p subshell of Fe 2+ . These computations lead to a better agreement with the measured product-charge-state distributions as compared to earlier work. We conclude that the L-shell absorption features of low-charged iron ions are useful for identifying gas-phase iron in the interstellar medium and for discriminating against the various forms of condensed-phase iron bound to composite interstellar dust grains.Unified Astronomy Thesaurus concepts: Interstellar atomic gas (833); Interstellar clouds (834); Interstellar medium (847); Interstellar absorption (831); Line intensities (2084); Atomic spectroscopy (2099); Line positions (2085); X-ray astronomy (1810); Laboratory astrophysics (2004)

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“…The systematic uncertainty of the measured cross sections is estimated to be ±15% at 90% confidence level [15]. The photon energy scale was calibrated by absorption measurements in a gas cell as described in detail in a recent publication on photoionization of C 4+ ions [21]. The present uncertainty of the photon energy scale amounts to ±0.2 eV.…”

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confidence: 99%

Multiple Photodetachment of Carbon Anions via Single and Double Core-Hole Creation

Perry‐Sassmannshausen

Buhr

Borovik

et al. 2020

Phys. Rev. Lett.

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We report on new measurements of m-fold photodetachment (m = 2 − 5) of carbon anions via K-shell excitation and ionization. The experiments were carried out employing the photon-ion merged-beams technique at a synchrotron light source. While previous measurements were restricted to double detachment (m = 2) and to just the lowest-energy K-shell resonance at about 282 eV, our absolute experimental m-fold detachment cross sections at photon energies of up to 1000 eV exhibit a wealth of new thresholds and resonances. We tentatively identify these features with the aid of detailed atomic-structure calculations. In particular, we find unambiguous evidence for fivefold detachment via double K-hole production.Atomic anions are highly correlated systems where the extra electron is weakly bound to an overall neutral charge distribution. Consequently, the number of excited states of atomic anions is quite limited [1] and some atomic species such as nitrogen do not form anions at all. A thorough treatment of the correlation effects in negative atomic ions still poses a formidable challenge to atomic theory, and this becomes even greater for innershell vacancies, since the valence electrons are then subject to strong many-electron relaxation effects following the creation of core holes [2, 3]. On the experimental side, core holes can be readily created by exciting or ionizing an inner-shell electron by a photon. For light ions, the core-hole state will subsequently decay via Auger transitions such that electrons are emitted with the net effect of photoionization. For negative ions, the entire process is termed (multiple) photodetachment.So far, photodetachment via the initial creation of a single K-hole has been experimentally studied only for a limited number of light anions up to F − [3-9]. For C − ions especially, previous measurements were carried out by Gibson et al. [7] and by Walter et al. [8] who studied double photodetachment in a very narrow photon energy range just covering the 1s 2 2s 2 2p 3 4 S → 1s 2s 2 2p 4 4 P resonance at about 282 eV. This scarcity of data is due to the fact that sufficiently high photon fluxes for more comprehensive studies were not available. Here, we present absolute cross sections, σ m , for m-fold photodetachment of C − ions by a single photon,with m = 2, 3, 4, 5 and photon energies from below the K-edge up to ∼1000 eV. These cross sections provide a view of the photodetachment dynamics of a highly correlated atomic system in unprecedented detail. Apart from the resonance at ∼282 eV, we observed a number of additional photodetachment resonances with a variety of line shapes as well as a clear signature for multiple detachment by direct double K-hole production. To better understand these observations, detailed atomic-structure calculations were performed by using the GRASP [10] and RATIP [11] codes as well as the Jena Atomic Calculator (JAC) [12]. To the best of our knowledge, there is only one other theoretical study of highly excited resonances in C − which, however, is focussed exc...

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Photoionization of metastable heliumlike C4+(1s2sS13

Cited by 41 publications

References 109 publications

Photoionization and photofragmentation of singly charged positive and negative Sc3N@C80 endohedral fullerene ions

Photoionization and photofragmentation of singly charged positive and negative Sc3N@C80 endohedral fullerene ions

Near L-edge Single and Multiple Photoionization of Doubly Charged Iron Ions

Multiple Photodetachment of Carbon Anions via Single and Double Core-Hole Creation

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