<i>K</i>-shell photoionization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>ions: Experiment and theory

Bizau, J. M.; Cubaynes, D.; Guilbaud, S.; Shorman, M. M. Al; Gharaibeh, M. F.; Ababneh, I Q; Blancard, C.; McLaughlin, B. M.

doi:10.1103/physreva.92.023401

Cited by 30 publications

(42 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In systems like the z = 0 absorption toward Mrk 509, the entire line could be the O II Kβ line-12. Table III of Bizau et al 2015), their line strengths would be similar. In Table 2 we list the EWs of O II lines in Galactic sightlines from Nicastro et al (2016); errors are 1σ and upper limits are 3σ.…”

Section: O II Kβ "Line 12" Strength From Kαmentioning

confidence: 69%

The O vi Mystery: Mismatch between X-Ray and UV Column Densities

Mathur

Nicastro

Gupta

et al. 2017

ApJL

Self Cite

View full text Add to dashboard Cite

The UV spectra of Galactic and extragalactic sightlines often show O VI absorption lines at a range of redshifts, and from a variety of sources from the Galactic circumgalactic medium to AGN outflows. Inner shell O VI absorption is also observed in X-ray spectra (at λ = 22.03Å), but the column density inferred from the X-ray line was consistently larger than that from the UV line. Here we present a solution to this discrepancy for the z = 0 systems. The O II Kβ line 4 S 0 → ( 3 D)3p 4 P at 562.40 eV (≡22.04Å) is blended with the O VI Kα line in X-ray spectra. We estimate the strength of this O II line in two different ways and show that in most cases the O II line accounts for the entire blended line. The small amount of O VI equivalent width present in some cases has column density entirely consistent with the UV value. This solution to the O VI discrepancy, however, does not apply to the high column density systems like AGN outflows. We discuss other possible causes to explain their UV/X-ray mismatch. The O VI and O II lines will be resolved by gratings on-board the proposed mission Arcus and the concept mission Lynx and would allow detection of weak O VI lines not just at z = 0 but also at higher redshift.

show abstract

Section: O II Kβ "Line 12" Strength From Kαmentioning

confidence: 69%

The O vi Mystery: Mismatch between X-Ray and UV Column Densities

Mathur

Nicastro

Gupta

et al. 2017

ApJL

Self Cite

View full text Add to dashboard Cite

show abstract

“…Combining with the single PI cross sections, we obtain the double PI cross sections. Our theoretical results are compared with the experiment of Bizau et al (2015) and we concluded that the DDAD processes of the final K-shell excited states are the origin of the double PI. We successfully diagnosed the population fraction of the prepared initial state in this experiment and interpreted the experimental results for the first time.…”

Section: Introductionmentioning

confidence: 75%

“…No data on the DDAD rates are available in the literature, to the best of our knowledge and thus we compare the natural lifetime widths with available experimental and theoretical results to evaluate the quality of our theoretical results. Our theoretical natural lifetime widths (fifth column), the measurements of Bizau et al (2015) (sixth column) and the previous available theoretical results (Zeng et al 2004;Bizau et al 2015;Garcia et al 2005) (seventh column) are given in (Bizau et al 2015). As the final state of the two resonance transitions is the same, the natural lifetime widths should, in principle, be nearly equivalent as the Auger decay rate is much larger than the radiative decay rate.…”

mentioning

confidence: 92%

“…All the above theoretical and experimental investigations are devoted to the single PI or single Auger decay processes. Very recently, Bizau et al (2015) experimentally measured the absolute cross sections for the single and double K-shell PI of O + and O 2+ ions in the 526−620 eV photon energy range by employing the ion-photon merged-beam technique with a high-resolution of resolving power ∼5300 at the SOLEIL synchrotron-radiation facility. To the best of our knowledge, however, no theoretical investigations were carried out to the double K-shell PI and double Auger decay of O + -O 4+ .…”

Section: Introductionmentioning

confidence: 99%

“…The single and direct double Auger decay rates for these K-shell (c) R-matrix computation from Bizau et al (2015).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Single and double K-shell resonant photoionization and Auger decay of 1s → 2p excited states of O⁺–O⁴⁺

Zeng

Liu

et al. 2017

A&A

View full text Add to dashboard Cite

In this work, single and double photoionization cross sections in the vicinity of 1s → 2p resonances are investigated theoretically for quantum states belonging to the ground and first excited configurations of O + -O 4+ . R-matrix method has been employed to obtain the single ionization cross section, whereas the double ionization cross sections are obtained by the branching ratios of the direct double Auger decay to the total Auger decay. By analyzing possible double ionization pathways, we conclude that the double photoionization originates predominately from the direct double Auger decay of the K-shell resonant states. Our theoretical work diagnosed the population fraction of the quantum state prepared in a recent experiment and successfully interpreted the experimental observations on both single and double photoionization cross sections.

show abstract