Inner-shell resonant absorption effects on evolution dynamics of the charge state distribution in a neon atom interacting with ultraintense x-ray pulses

Xiang, Wenjun; Cheng, Guangquan; Fu, Yongsheng; Zeng, Jiaolong; Yuan, Jing

doi:10.1103/physreva.86.061401

Cited by 28 publications

(44 citation statements)

References 31 publications

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“…Yet the model failed to adequately describe ion yields for photon energies above the K-shell ionization threshold. Subsequent theoretical research [17,34,35] revealed that there are substantial further many-electron effects in neon in this case. Specifically, shake off following K-shell ionization [17] and double Auger decay of a K-shell vacancy [35] were included in extended rate-equation models for neon.…”

Section: Introductionmentioning

confidence: 88%

“…To gain insights into the time-dependent quantum dynamics of the absorption of x rays and the resulting decay processes, we employ the rate-equation approximation [13,15,16,32,39] that has been used successfully in a number of studies to describe experiments, e.g., Refs. 9,12,13,15,17,31,[33][34][35][36]. Exemplary rate equations for a nitrogen atom restricted to K-shell electrons are given in Ref.…”

Section: X-ray Interaction With Neon Atomsmentioning

confidence: 99%

“…The discrepancy in the Ne 7+ ion yield in the lower panel can be ascribed to an inner-shell resonant excitation [17] which is not included in our modified rate equations. Such resonant processes have a significant impact on the ion yields for an x-ray energy of 1050 eV [34] (see below).…”

Section: Ion Yields Of Neon Atomsmentioning

confidence: 99%

“…The novel FEL facilities which produce x rays with unprecedented characteristics inspire one to investigate processes, known from the strong-field interaction of optical lasers with atoms, but with x rays that go be-Neon has been studied extensively in LCLS radiation both experimentally [12,17,31] and theoretically [32][33][34][35][36][37]. The quantum dynamics of neon atoms in intense and ultrashort x-ray radiation was initially described theoretically with a plain rate-equation model [12,32,33] that considered only one-photon cross sections and radiative and Auger decay widths.…”

Section: Introductionmentioning

confidence: 99%

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Neon in ultrashort and intense x-rays from free electron lasers

Buth

Beerwerth

Obaid

et al. 2018

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

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We theoretically examine neon atoms in ultrashort and intense x rays from free electron lasers and compare our results with data from experiments conducted at the Linac Coherent Light Source (LCLS). For this purpose, we treat in detail the electronic structure in all possible nonrelativistic cationic configurations using a relativistic multiconfiguration approach. The interaction with the x rays is described in rate-equation approximation. To understand the mechanisms of the interaction, a path analysis is devised which allows us to investigate what sequences of photoionization and decay processes lead to a specific configuration and with what probability. Thereby, we uncover a connection to the mathematics of graph theory and formal languages. In detail, we study the ion yields and find that plain rate equations do not provide a satisfactory description. We need to extend the rate equations for neon to incorporate double Auger decay of a K-shell vacancy and photoionization shake off for neutral neon. Shake off is included for valence and core ionization; the former has hitherto been overlooked but has important consequences for the ion yields from an x-ray energy below the core ionization threshold. Furthermore, we predict the photon yields from xuv and x-ray fluorescence; these allow one insights into the configurations populated by the interaction with the x rays. Finally, we discover that inaccuracies in those Auger decay widths employed in previous studies have only a minor influence on ion and photon yields.Keywords: ultrashort and intense x rays, neon atom, multiconfiguration Dirac-Hartre-Fock, rate equations, free-electron laser, ion yield, photon yield I. INTRODUCTIONAtoms are the basic constituents of aggregates of matter realized in molecules, clusters, and solids. In this way, the study of the interaction of intense and ultrafast x rays with atoms is of fundamental importance for all research involving matter in such light. Intense x rays offer manifold novel perspectives for science such as diffraction experiments with single molecules [1] and x-ray quantum optics [2].Experimentally, research with intense and ultrafast x rays has only recently become a reality by the novel x-ray free electron lasers (FELs) of which there are presently four producing soft to hard x rays: the Linac Coherent Light Source (LCLS) [3,4] in Menlo Park, California, USA, the SPring-8 Angstrom Compact free electron LAser (SACLA) [5] in Sayo-cho, Sayo-gun, Hyogo, Japan, the SwissFEL [6] in Villigen, Switzerland, and the European X-Ray Free-Electron Laser (XFEL) [7] in Hamburg, Germany.The novel FEL facilities which produce x rays with unprecedented characteristics inspire one to investigate processes, known from the strong-field interaction of optical lasers with atoms, but with x rays that go be- * World Wide Web: www.christianbuth.name, electronic mail; christian.buth@web.de yond the well-established one-x-ray-photon science only possible at synchrotron light sources [8]. With x rays the sequential absorption of multiple pho...

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Section: Introductionmentioning

confidence: 88%

Section: X-ray Interaction With Neon Atomsmentioning

confidence: 99%

Section: Ion Yields Of Neon Atomsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Neon in ultrashort and intense x-rays from free electron lasers

Buth

Beerwerth

Obaid

et al. 2018

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

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“…[18,19]. Also the importance of single resonant excitation was found in the study of the Ne atom experimentally [11] and theoretically [20].…”

Section: Introductionmentioning

confidence: 92%

Interplay between relativistic energy corrections and resonant excitations in x-ray multiphoton ionization dynamics of Xe atoms

2017

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In this paper, we theoretically study x-ray multiphoton ionization dynamics of heavy atoms taking into account relativistic and resonance effects. When an atom is exposed to an intense x-ray pulse generated by an x-ray free-electron laser (XFEL), it is ionized to a highly charged ion via a sequence of single-photon ionization and accompanying relaxation processes, and its final charge state is limited by the last ionic state that can be ionized by a single-photon ionization. If x-ray multiphoton ionization involves deep inner-shell electrons in heavy atoms, energy shifts by relativistic effects play an important role in ionization dynamics, as pointed out in Phys. Rev. Lett. 110, 173005 (2013). On the other hand, if the x-ray beam has a broad energy bandwidth, the high-intensity x-ray pulse can drive resonant photoexcitations for a broad range of ionic states and ionize even beyond the direct one-photon ionization limit, as first proposed in Nat. Photon. 6, 858 (2012). To investigate both relativistic and resonance effects, we extend the XATOM toolkit to incorporate relativistic energy corrections and resonant excitations in x-ray multiphoton ionization dynamics calculations. Charge-state distributions are calculated for Xe atoms interacting with intense XFEL pulses at a photon energy of 1.5 keV and 5.5 keV, respectively. For both photon energies, we demonstrate that the role of resonant excitations in ionization dynamics is altered due to significant shifts of orbital energy levels by relativistic effects. Therefore, it is necessary to take into account both effects to accurately simulate multiphoton multiple ionization dynamics at high x-ray intensity.

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Effects of Direct Double Auger Decay on the Population Dynamics of Neon Irradiated by Ultraintense x‐ray Pulses

Cheng

Zeng

Yuan

2014

Contrib. Plasma Phys.

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The population and charge state distribution of neon interacting with ultraintense x-ray pulses are investigated by solving a time-dependent rate equation in the detailed level-accounting (DLA) approximation. Due to the detailed description of neon atom and ions, our DLA result improves the agreement between predictions and experimental measurements for odd neon charge states. In the framework of the DLA formalism, we further studied the effects of direct double Auger decay (DDAD) on charge state distribution. After the 1s photoionization of neon atom, the DDAD processes give accessible decay channels from the K-shell hole state of Ne + to levels of Ne 3+ , resulting in an increase of the population fraction of Ne 3+ and a decrease of that of Ne 2+ . Compared with the results without considering the DDAD effects, better agreement is obtained between theory and experiment.

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Inner-shell resonant absorption effects on evolution dynamics of the charge state distribution in a neon atom interacting with ultraintense x-ray pulses

Cited by 28 publications

References 31 publications

Neon in ultrashort and intense x-rays from free electron lasers

Neon in ultrashort and intense x-rays from free electron lasers

Interplay between relativistic energy corrections and resonant excitations in x-ray multiphoton ionization dynamics of Xe atoms

Effects of Direct Double Auger Decay on the Population Dynamics of Neon Irradiated by Ultraintense x‐ray Pulses

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