Evolution dynamics of charge state distribution in neon interaction with x-ray pulses of variant intensities and durations

Cheng, Guangquan; Zeng, Jiaolong; Yuan, Jing

doi:10.1016/j.hedp.2015.03.003

Cited by 6 publications

(5 citation statements)

References 33 publications

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“…The rates of the inverse processes are obtained by the principle of detailed balance. The level populations are obtained by solving the TDRE over a mesh grid of space (spatial step of 0.1 μm) and time (temporal step of 1 femtosecond (fs)), which was verified for the present calculations [64]. Before the interaction, all atoms are assumed to be initially in the ground state ( s s p 1 2 2…”

Section: Theoretical Methodsmentioning

confidence: 99%

“…The continuum wave functions are obtained by using the relativistic distorted wave methods [65]. Electron correlations are considered between the fine-structure levels of single and double excitations from all possible subshells of p 2 , s 2 and core shell s 1 up to the principal quantum number n=4 for all ionization stages from the neutral atom to the bare ion [64]. The same set of quantum states is included in the rate equation.…”

Section: Microscopic Processes and Atomic Datamentioning

confidence: 99%

See 1 more Smart Citation

Single- and double-core-hole ion emission spectroscopy of transient neon plasmas produced by ultraintense x-ray laser pulses

Cheng

Zeng

Yuan

2016

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

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Double core-hole (DCH) spectroscopy is investigated systematically for neon atomic system in the interaction with ultraintense x-ray pulses with photon energy from 937 eV to 2000 eV. A time-dependent rate equation, implemented in the detailed level accounting approximation, is utilized to study the dynamical evolution of the level population and emission properties of the highly transient plasmas. For x-ray pulses with photon energy in the range of 937-1030 eV, where 1s → 2p resonance absorption from single core-hole (SCH) states of neon charge states exist, inner-shell resonant absorption (IRA) effects play important roles in the time evolution of population and DCH spectroscopy. Such IRA physical effects are illustrated in detail by investigating the interaction of x-ray pulses at a photon energy of 944 eV, which corresponds to the 1s → 2p resonant absorption from the SCH states (1s2s 2 2p 4 , 1s2s2p 5 and 1s2p 6 ) of Ne 3+ . After averaging over the space and time distribution of the x-ray pulses, DCH spectroscopy at photon energies of 937, 944, 955, 968, 980, and 990 eV (corresponding to the 1s → 2p resonance energies of Ne 2+ -Ne 7+ , respectively) are studied in detail. The complex mechanisms of producing the DCH states are discussed, taking the DCH spectroscopy at 937 and 980 eV as examples. For photon energy larger than 1362 eV, there are no resonance absorption in the interaction, resulting in a similar physical picture of DCH spectroscopy. The dominant DCH states are due to higher ionization stages of Ne 7+ -Ne 9+ , while the DCH spectroscopy from lower charge states Ne 2+ -Ne 6+ are much weaker. With the increase of x-ray photon energy, the contributions from the lower charge states become larger.

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Section: Theoretical Methodsmentioning

confidence: 99%

Section: Microscopic Processes and Atomic Datamentioning

confidence: 99%

Single- and double-core-hole ion emission spectroscopy of transient neon plasmas produced by ultraintense x-ray laser pulses

Cheng

Zeng

Yuan

2016

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

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“…We previously investigated the population kinetics in the interaction of XFEL with Ne by directly solving a TDRE [27,28,32,[35][36][37]. In the present work, we developed a Monte Carlo method to solve the TDRE to study the population kinetics of Ar atoms interacting with XFEL.…”

Section: Time-dependent Rate Equation: a Monte Carlo Methodsmentioning

confidence: 99%

“…Theoretically, a time-dependent rate equation (TDRE) approach is effective for investigating ionization dynamics. For low-Z atoms interacting with XFEL, directly solving the TDRE is feasible and widely used [23][24][25][26][27][28]. For medium-and heavy-Z atomic systems and those involving K-shell ionization and excitation, however, theoretical simulation remains a great challenge [8,9,19,21].…”

Section: Introductionmentioning

confidence: 99%

Effects of single-photon double photoionization and direct double Auger decay on K-shell ionization kinetics of Ar atoms interacting with XFEL pulses

Li¹,

Gao²,

Zeng³

et al. 2022

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

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In studies investigating the interaction of matter with ultraintense, ultrashort Xray free electron laser (XFEL) pulses, the evolution kinetics are generally described by directly solving a time-dependent rate equation that considers single-photon and single-electron processes. In the present study, we show the eﬀects of single-photon double photionization and direct double Auger decay in the K-shell ionization kinetics of XFELs interaction with argon atoms. Because a huge number of coupled transition channels are present in the K-shell ionization, we develop a Monte Carlo method to simulate the complex ionization kinetic processes and give the level population evolution of ions and charge state distribution (CSD). The K-shelldominated ionization dynamics of Ar irradiated by XFEL pulses with photon energies of 5000, 5500 and 6500 eV are investigated and compared with available experimental observations of the CSD. The results show that the population fractions of Ar5+, Ar6+ and Ar9+ are increased by 78%, 152% and 144%, respectively, by these higher-order processes at a photon energy of 5000 eV. Including the direct double-electron processes, the predicted CSDs are in better agreement with the experiments carried out at the photon energies of 5000, 5500 and 6500 eV. It is expected that the developed theoretical formalism can be used to more accurately calibrate the beam proﬁle and intensity of XFELs.

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“…These ions populations have been theoretically simulated. [25][26][27] In the hard x-ray region, the single-photon ionization dominates, and inner-shell electrons are photo-ejected preferentially when allowed. All inner-shell electrons for a given atom may be removed before Auger decay or other relaxation processes occur when innershell photoabsorption reaches saturation.…”

Section: Introductionmentioning

confidence: 99%

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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Evolution dynamics of charge state distribution in neon interaction with x-ray pulses of variant intensities and durations

Cited by 6 publications

References 33 publications

Single- and double-core-hole ion emission spectroscopy of transient neon plasmas produced by ultraintense x-ray laser pulses

Single- and double-core-hole ion emission spectroscopy of transient neon plasmas produced by ultraintense x-ray laser pulses

Effects of single-photon double photoionization and direct double Auger decay on K-shell ionization kinetics of Ar atoms interacting with XFEL pulses

Charge-state populations for the neon-XFEL system*

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