Absolute measurement of radiative and Auger rates of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>K</mml:mi><mml:mo>−</mml:mo><mml:mtext>shell</mml:mtext><mml:mo>−</mml:mo><mml:mtext>vacancy</mml:mtext></mml:math>states in highly charged Fe ions

Steinbrügge, René; Bernitt, Sven; Epp, Sascha W.; Rudolph, Jan; Beilmann, C.; Bekker, Hendrik; Eberle, S.; Müller, A.; Versolato, Oscar; Wille, Hans‐Christian; Yavaş, Hasan; Ullrich, J.; López‐Urrutia, J. R. Crespo

doi:10.1103/physreva.91.032502

Cited by 27 publications

(21 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More distantly related experimental work comprises the spectroscopy of the L-shell emission -as is observed, e.g., in X-ray spectra of active galactic nuclei (Fabian et al 2009) -from electron-impact excitation of highly ionized iron ions at an EBIT (Gu et al 2001;Chen et al 2006;Beiersdorfer et al 2013), photoexcitation of highly charged iron ions in an EBIT (Epp et al 2007;Bernitt et al 2012;Rudolph et al 2013;Steinbrügge et al 2015), 3p detachment from Fe − (Dumitriu et al 2010), and electron-impact ionization and electron-ion recombination of multiply-charged iron ions in a heavy-ion storage ring (e.g., Savin et al 2002;Schippers et al 2010;Bernhardt et al 2014;Hahn et al 2015). The latter process can be viewed as the timeinverse of photoionization and is therefore very suitable to test corresponding theories (Schippers et al 2002;Müller et al 2009;Müller et al 2014).…”

Section: Previous Related Workmentioning

confidence: 99%

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

Beerwerth

Buhr

Perry‐Sassmannshausen

et al. 2017

ApJ

View full text Add to dashboard Cite

Absolute cross sections for m-fold photoionization (m = 1, . . . , 6) of Fe + by a single photon were measured employing the photon-ion merged-beams setup PIPE at the PETRA III synchrotron light source, operated by DESY in Hamburg, Germany. Photon energies were in the range 680-920 eV which covers the photoionization resonances associated with 2p and 2s excitation to higher atomic shells as well as the thresholds for 2p and 2s ionization. The corresponding resonance positions were measured with an uncertainty of ±0.2 eV. The cross section for Fe + photoabsorption is derived as the sum of the individually measured cross-sections for m-fold ionization. Calculations of the Fe + absorption cross sections have been carried out using two different theoretical approaches, Hartree-Fock including relativistic extensions and fully relativistic Multi-Configuration Dirac Fock. Apart from overall energy shifts of up to about 3 eV, the theoretical cross sections are in good agreement with each other and with the experimental results. In addition, the complex deexcitation cascades after the creation of inner-shell holes in the Fe + ion have been tracked on the atomic fine-structure level. The corresponding theoretical results for the product charge-state distributions are in much better agreement with the experimental data than previously published configuration-average results. The present experimental and theoretical results are valuable for opacity calculations and are expected to pave the way to a more accurate determination of the iron abundance in the interstellar medium.

show abstract

Section: Previous Related Workmentioning

confidence: 99%

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

Beerwerth

Buhr

Perry‐Sassmannshausen

et al. 2017

ApJ

View full text Add to dashboard Cite

show abstract

“…An Electron-Beam-Ion-Trap (EBIT) [30] comes closest to this scheme. Ions are held in a trap potential for a time span τ and exposed to an intense electron beam of sufficiently high energy ( [31][32][33] and references therein). The number of ionizing collisions with one ion and, hence, the final charge state of the atom is determined by the product n e τ where n e is the electron number density in the beam.…”

Section: Ion Production and Associated Population Of Excited Statesmentioning

confidence: 99%

Fusion-Related Ionization and Recombination Data for Tungsten Ions in Low to Moderately High Charge States

Müller

2015

Atoms

View full text Add to dashboard Cite

Collisional processes and details of atomic structure of heavy many-electron atoms and ions are not yet understood in a fully satisfying manner. Experimental studies are required for guiding new theoretical approaches. In response to fusion-related needs for collisional and spectroscopic data on tungsten atoms in all charge states, a project has been initiated in which electron-impact and photon-induced ionization as well as photorecombination of W q+ ions are studied. Cross sections and rate coefficients were determined for charge states q ranging from q = 1 to q = 5 for photoionization, for q = 1 up to q = 19 for electron-impact ionization and for q = 18 to q = 21 for electron-ion recombination. An overview, together with a critical assessment of the methods and results is provided.

show abstract

“…An overview of deep-inner-shell photoabsorption by atomic cations and anions has been provided recently by Müller (Müller 2015). Experimental data on K-shell photoionization and photoexcitation of positive ions with atomic numbers  Z 3 have been published for Li +  (Carroll & Kennedy 1977;Kiernan et al 1994;Mosnier et al 2000;Scully et al 2006), Be +  (Mehlmann & Esteva 1974), B + (Müller et al 2014), B 2+ (Müller et al 2010a), C + (Schlachter et al 2004;Müller et al 2015), C 2+ (Scully et al 2005), C 3+ (Müller et al 2009), N + (Gharaibeh et al 2011), N 2+ (Gharaibeh et al 2014) (Rudolph et al 2013;Steinbrügge et al 2015), Fe 24+ (Rudolph et al 2013), and Kr 34+ . K-shell photoionization experiments with neutral neon atoms have employed static gas targets, and a large body of papers has addressed specific features in the excitation and decay of K-shell vacancies in neon atoms.…”

Section: Introductionmentioning

confidence: 99%

Photoionization of Ne Atoms and Ne⁺ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections

Müller

Bernhardt

Borovik

et al. 2017

ApJ

114

View full text Add to dashboard Cite

Single, double, and triple photoionization of Ne + ions by single photons have been investigated at the synchrotron radiation source PETRA III in Hamburg, Germany. Absolute cross-sections were measured by employing the photon-ion merged-beams technique. Photon energies were between about 840 and 930 eV, covering the range from the lowest-energy resonances associated with the excitation of one single K-shell electron up to double excitations involving one K-and one L-shell electron, well beyond the K-shell ionization threshold. Also, photoionization of neutral Ne was investigated just below the K edge. The chosen photon energy bandwidths were between 32 and 500 meV, facilitating the determination of natural line widths. The uncertainty of the energy scale is estimated to be 0.2 eV. For comparison with existing theoretical calculations, astrophysically relevant photoabsorption cross-sections were inferred by summing the measured partial ionization channels. Discussion of the observed resonances in the different final ionization channels reveals the presence of complex Auger-decay mechanisms. The ejection of three electrons from the lowest K-shell-excited Ne + ( s s p 1 2 2 S 2 6 2 1 2 ) level, for example, requires cooperative interaction of at least four electrons.

show abstract

Absolute measurement of radiative and Auger rates ofK−shell−vacancystates in highly charged Fe ions

Cited by 27 publications

References 45 publications

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

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

Fusion-Related Ionization and Recombination Data for Tungsten Ions in Low to Moderately High Charge States

Photoionization of Ne Atoms and Ne⁺ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections

Contact Info

Product

Resources

About

Absolute measurement of radiative and Auger rates ofK−shell−vacancystates in highly charged Fe ions

Cited by 27 publications

References 45 publications

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

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

Fusion-Related Ionization and Recombination Data for Tungsten Ions in Low to Moderately High Charge States

Photoionization of Ne Atoms and Ne+ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections

Contact Info

Product

Resources

About

Photoionization of Ne Atoms and Ne⁺ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections