Traces in ion yields and electron spectra of the formation of Ar inner-shell hollow states by free-electron lasers

Wallis, Amber; Banks, H. I. B.; Emmanouilidou, A.

doi:10.1103/physreva.91.063402

Cited by 11 publications

(23 citation statements)

References 20 publications

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“…In addition, using the method we developed in ref. 10 we compute the Auger rates for all allowed atomic transitions while we obtain the atomic single-photon ionization cross sections from ref. 47.…”

Section: Resultsmentioning

confidence: 99%

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Interaction of molecular nitrogen with free-electron-laser radiation

Banks

Little

Tennyson

et al. 2017

Phys. Chem. Chem. Phys.

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We compute molecular continuum orbitals in the single center expansion scheme. We then employ these orbitals to obtain molecular Auger rates and single-photon ionization cross sections to study the interaction of N 2 with Free-Electron-Laser (FEL) pulses. The nuclei are kept fixed. We formulate rate equations for the energetically allowed molecular and atomic transitions and we account for dissociation through additional terms in the rate equations. Solving these equations for different parameters of the FEL pulse, allows us to identify the most efficient parameters of the FEL pulse for obtaining the highest contribution of double core hole states (DCH) in the final atomic ion fragments. Finally we identify the contribution of DCH states in the electron spectra and show that the DCH state contribution is more easily identified in the photo-ionization rather than the Auger transitions.

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Section: Resultsmentioning

confidence: 99%

“…There has been a significant amount of work on calculating the Auger rates and photo-ionization cross sections in atoms [9][10][11][12][13][14] and molecules. [15][16][17][18][19][20][21] Computing these rates for molecules is more challenging.…”

Section: Introductionmentioning

confidence: 99%

Interaction of molecular nitrogen with free-electron-laser radiation

Banks

Little

Tennyson

et al. 2017

Phys. Chem. Chem. Phys.

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“…It applies to complex multi-electron atoms with bound orbital wave functions that can be accurately described when accounting for several angular momentum l quantum numbers. In contrast, the previous formalism we employed for computing single-photon ionisation cross sections and Auger rates for argon [22,23] and the formalism employed in the XATOM-model [24] use bound orbital wave functions described by only one l quantum number. Thus, the current formalism, allows for a more accurate computation of the single-photon ionization cross sections and Auger rates in the non-relativistic regime.…”

Section: Introductionmentioning

confidence: 99%

Auger cascades leading to higher charged states in xenon driven by an X-ray free-electron-laser pulse

2020

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We study the interaction of xenon with an 850 eV photon energy FEL pulse. We compute singlephoton ionisation cross sections and Auger rates by adopting to atoms a formalism we previously developed for diatomic molecules. In this formulation, a bound orbital is expressed as a sum of wave functions each corresponding to a different l quantum number. In contrast, in previous formulations only one l quantum number is associated with a bound orbital. As a result, in the non-relativistic regime, the description of the bound states is more accurate in our computations. Employing a Monte-Carlo technique, we find that our results for the ion state yields of xenon compare well with experimental results. Moreover, we find that when xenon is driven by two FEL pulses of the same energy but different pulse duration, higher-charged states are produced in the case of the longer duration and less intense laser pulse. An analysis of the ionization pathways reveals that less single-photon absorptions underlie the formation of each higher-charged state for the longer duration pulse compared to the shorter one. We find that the reason for the formation of higher-charged states for the longer duration pulse is the prevalence of Auger cascades.

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“…Although many researches on SCH and DCH states have been carried out in the past decades, however, very few studies are reported in the literature on the production of triple-core-hole (TCH) states 30 – 32 . Wallis et al .…”

Section: Introductionmentioning

confidence: 99%

“…Wallis et al . 30 theoretically studied the formation of TCH states in the 2p shell of an argon atom interacting with a free electron laser pulse. Carravetta et al .…”

Section: Introductionmentioning

confidence: 99%

Triple-core-hole states produced in the interaction of solid-state density plasmas with a relativistic femtosecond optical laser

Cheng

Liu

et al. 2018

Sci Rep

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Extremely exotic dense matter states can be produced in the interaction of a relativistic femtosecond optical laser with a solid density matter. Here we theoretically investigate triple-core-hole (TCH) states produced by an intense polychromatic x-ray field formed by hot electrons in the interaction of a relativistic femtosecond optical laser with a thin silver foil. X-ray emission spectra of solid-density silver plasmas show unambiguously the production of TCH states at an electron temperature of a few hundreds of eV and radiative temperature of 1–3 keV of the polychromatic x-ray field. Practical calculations show that the emissivity originating from the TCH states exceeds that from the single- and double-core-hole states in Ne-like Ag37+ at electron temperature of ~500 eV and radiative temperature of ~1500 eV. For the neighbouring ionization stages of Ag36+ and Ag38+, TCH emissivity is roughly equivalent or comparable to that from the single- and double-core-hole states. Present work deepens our insight into investigation of the properties of extremely exotic states, which is important in high energy density physics, astrophysics and laser physics.

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Traces in ion yields and electron spectra of the formation of Ar inner-shell hollow states by free-electron lasers

Cited by 11 publications

References 20 publications

Interaction of molecular nitrogen with free-electron-laser radiation

Interaction of molecular nitrogen with free-electron-laser radiation

Auger cascades leading to higher charged states in xenon driven by an X-ray free-electron-laser pulse

Triple-core-hole states produced in the interaction of solid-state density plasmas with a relativistic femtosecond optical laser

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