2000 eV X-ray laser transparent mechanism of neon atom

冯雷,; 蒋刚,

doi:10.7498/aps.66.153201

Cited by 3 publications

(6 citation statements)

References 9 publications

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“…If photoionization rates, Auger decay rates, and fluorescence decay rates are time-independent constants, the most prominent ionization pathway is obtained by comparing these photoionization and decay rates. [20] But the photoionization rate R p is a function of time in this paper, and we obtain the most prominent ionization pathway by the most important product. Take the first step and the second step of the most prominent ionization pathway at E = 2 keV, N p = 10 10 , and W = 1 fs as an example.…”

Section: Average Chargementioning

confidence: 89%

“…And photoionization cross sections σ p of each shell for different configurations of neon at photon energies E = 4 keV, 6 keV, and 8 keV calculated using FAC are shown in Table 1, while σ p at E = 2 keV, Auger decay rates R a and fluorescence decay rates R f of neon are taken from Refs. [20] and [31], which are also calculated by FAC. It can be seen that σ p decrease with the increase of the selected photon energy.…”

Section: Rate Equations For Photoionization and Relaxation Dynamicsmentioning

confidence: 99%

“…[10][11][12] Consequently, many important scientific achievements have been made in the fields of atomic, molecular, and optical physics, [2,13,14] condensed matter physics, [15] matter in extreme conditions, [16] chemistry and soft matters, [17] and biology, [18,19] etc. Novel phenomena appear when XFEL interact with atoms and ions, [20] such as saturation absorption, [21] x-ray transparency, [2,20,22] and hollow atoms. [2,23] In particular, the formation of hollow atoms following continuous photoionization of the inner shells leads to x-ray transparency.…”

Section: Introductionmentioning

confidence: 99%

“…[2,23] In particular, the formation of hollow atoms following continuous photoionization of the inner shells leads to x-ray transparency. [2,20] Both experimental [2] and theoretical [24] results have revealed how the electrons of a free neon atom response to ultra intense, ultrafast x-ray pulses. When XFEL interact with the neon atom, various ions are produced.…”

Section: Introductionmentioning

confidence: 99%

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Charge-state populations for the neon-XFEL system*

Deng¹,

Jiang²

2019

Chinese Phys. B

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The interaction between neon and x-ray free-electron lasers with different laser parameters is systematically studied by solving a set of coupled rate equations. As an example, the evolution of 1s12s22p6 configuration is given under different incident photon numbers, pulse widths, and photon energies. We have also determined all of the charge-state populations as a function of three laser pulse parameters by averaging over time. The result shows that the variations of these charge-state populations demonstrate a pattern when the pulse width is shorter than 10 fs: some of the charge-states decrease rapidly, while the others rise but remain relatively constant for pulse width larger than 10 fs. The variation of the average charge with three parameters has also obtained. The average charge decreases for a pulse width shorter than 10 fs but remains basically unchanged for a pulse width longer than 10 fs.

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Section: Average Chargementioning

confidence: 89%

Section: Rate Equations For Photoionization and Relaxation Dynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Charge-state populations for the neon-XFEL system*

Deng¹,

Jiang²

2019

Chinese Phys. B

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“…In addition, the diffraction image obtained achieves the best quality. [11][12][13][14] According to the Eu-ropean XFEL, the range of photon energy that can be achieved during the current experiment is 0.2-25 keV. [15,16] Due to the limitation of photon energy generated by a laser and the hollow atoms in medium-and high-Z elements have high decay probability, the saturable absorption is not apparent.…”

Section: Introductionmentioning

confidence: 89%

Theoretical study of the enhancement of saturable absorption of Kr under x-ray free-electron laser

Ye¹,

Yang²,

Chen³

et al. 2023

Chinese Phys. B

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The generation of hollow atoms will reduce the probability of light absorption and provide a high-quality diffraction image in the experiment. In this paper, we calculate the ionization rate of the Kr atom under XFEL using Hartree-Fock-Slater model and simulate the ionization model of Kr atom using Monte Carlo method in order to determine the response of the hollow atom of Kr atom to the XFEL photon energy. By calculating the correlation between the total photoionization cross-section of the ground state of Kr atom and the photon energy, we determined three particular photon energies of 1.75 keV, 1.90 keV, and 14.30 keV. The dynamics simulation under the experimental condition’s 17.50 keV photon energy was achieved by implementing the Monte Carlo method and calibrating the photon flux modeling parameters. Consequently, our calculated data are more consistent with experimental phenomena than previous theoretical studies. The saturable absorption of Kr at 1.75 keV, 1.90 keV, 14.30 keV, and 17.50 keV energies was further investigated using the optimized photon flux model theory. We compared the statistics on main ionization paths under those four specific photon energies and calculated the population changes of various Kr hollow atoms with different configurations. The results demonstrate that the population of hollow atoms produced at the critical ionization photon energy is high. Furthermore, the change of population with respect to position is smooth, which shows a significant difference between the generation mode of ions with low and high photon energy. The result is important for the study of medium- and high-Z element hollow atoms, which has substantial implications for the study of hollow atoms with medium and high charge states, as well as for the scaling of photon energy of free electron lasers.

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Radiative and Auger transitions of K-shell excited resonance states in boron-like sulfur ion

Sun¹,

Hu²,

Sang³

et al. 2019

Acta Phys. Sin.

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<sec>Non-relativistic energy values and wave functions of the K-shell excited resonance states 1s2s22p2, 1s2s2p3, 1s2p4 2, 4L (L = S, P, D) in boron-like sulfur ion are calculated in the frame of multi-configuration saddle-point variation method. The electron correlation effects are considered by the expansion of configuration wave function. The wave functions are constructed and optimized by the orbital-spin angular momentum partial waves selected based on the rule of configuration interaction. To saturate the wave functional space and to improve the non-relativistic energy, the restricted variational method is used to calculate the restricted variational energy. Then, the mass polarization effect and relativistic correction are calculated by the perturbation theory. The quantum electrodynamics (QED) effect and higher-order relativistic correction are considered by the screened hydrogenic formula. Furthermore, the energy shift originating from the interaction between closed channel and open channel is also calculated. Finally, the accurate relativistic energy levels for these resonance states are obtained by adding the non-relativistic energy and all corrections.</sec><sec>Using the optimized wave functions, the line strengths, oscillator strengths, radiative transition rates and transition wavelengths of electric-dipole transitions for the K-shell excited resonance states in boron-like sulfur ion are systematically calculated. In this work, the oscillator strengths and transition rates are given in the length, velocity, and acceleration gauges. The good agreement among the three gauges reflects that the calculated wave functions are reasonably accurate. The calculated radiative transition rates and transition wavelengths are compared with other theoretical data. Good agreement is obtained except the transition: 1s2s(3S)2p3 2Po→1s22s2p2 2D. The deviation between our theoretical result and the MCDF theoretical value is about 46%, which needs further verifying. The Auger rates, Auger branching ratios, and Auger electron energy values of the important decay channels of the K-shell excited states are calculated by the saddle-point complex-rotation method. The calculated Auger rates and Auger electron energy values are also in good agreement with the corresponding reference data. For some K-shell states, the related energy levels and Auger branching ratios are reported for the first time. The present calculations results will provide valuable theoretical data for the calibration of spectral lines and Auger electron spectra in the relevant experiments.</sec>

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2000 eV X-ray laser transparent mechanism of neon atom

Cited by 3 publications

References 9 publications

Charge-state populations for the neon-XFEL system*

Charge-state populations for the neon-XFEL system*

Theoretical study of the enhancement of saturable absorption of Kr under x-ray free-electron laser

Radiative and Auger transitions of K-shell excited resonance states in boron-like sulfur ion

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