Soft parameters in Coulomb potential of noble atoms for nonsequential double ionization: Classical ensemble model and simulations

Truong, Thu D. H.; Nguyen, Hanh H.; Le, Hieu B.; Dung, Do Hung; Tran, Huu-Toan; Vy, Nguyen Duy; Duong, Anh-Tai, Tran; Pham, Vinh N. T.

doi:10.1016/j.cpc.2022.108372

Cited by 6 publications

(6 citation statements)

References 33 publications

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“…In particular, this model can show the "knee structure" with very good agreement with experiment [27]. Truong et al believe that besides huge computational demands, physical propagation of the ionized electron cannot be traced by TDSE [33]. Therefore, they used a classical ensemble model for Ar atom, and with using a soft parameter for Coulomb potential as 𝑎 = 1.5 , they could achieve the knee structure at the intensity range of 𝐼 = 4.0 × 10 14 𝑊/𝑐𝑚 2 to 𝐼 = 5.0 × 10 14 𝑊/𝑐𝑚 2 .…”

Section: Introductionsupporting

confidence: 59%

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High-order harmonic generation, attosecond pulse train, and non- sequential double ionization in the helium atom under high-intensity femtosecond laser pulses

Zakavi

Sabaeian

2023

Preprint

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High-order harmonic generation (HHG), attosecond pulse train (APT), and non-sequential double ionization (NSDI) in the He atom under high intense femtosecond laser pulses are calculated by time-dependent Schrodinger equation (TDSE) in one dimension (1D). By considering the mutual electron-electron and electron-nuclei interactions along with calculating the He atom ground state wave function by imaginary time propagation (ITP) method, besides calculating probability density of electrons, dipole acceleration, HHG, and APT, we could generate the well-known "knee structure" in the probability of the He atom ionization against the intensity in an ionization boundary condition model. The results are in good agreement with the experimental data reported by Walker et al. [B. Walker et al. Phys. Rev. Lett. 73, 1227 (1994)].

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Section: Introductionsupporting

confidence: 59%

“…The investigation of soft core potential constant has been reported in the fewer works [33]. After making sure about the accuracy of the ground state wave function, we put it as an initial condition in the TDSE and calculate the time-dependent wave function, dipole acceleration, HHG, and NSDI.…”

Section: Introductionmentioning

confidence: 99%

High-order harmonic generation, attosecond pulse train, and non- sequential double ionization in the helium atom under high-intensity femtosecond laser pulses

Zakavi

Sabaeian

2023

Preprint

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“…In this paper, we use a two-dimensional classical ensemble model to simulate the NSDI process 13,26,27 .…”

Section: Methodsmentioning

confidence: 99%

“…In addition, soft parameters a = 1.5 and b = 0.1 are used to prevent possible automatic ionization and Coulomb potential singularities 27,28 .…”

Section: Methodsmentioning

confidence: 99%

Controlling nonsequential double ionization mechanisms of argon atoms by parallel two-color laser pulses

2023

Sci. Tech. Dev. J.

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Introduction: Recently, physicists have been interested in the nonsequential double ionization (NSDI) process since it provides information about the interaction between electrons in the atomic and molecular shells through the recollistion process. Technically, the development of near-infrared laser pulses has made them one of the most useful tools for studying the electron correlation effect in atoms and molecules. Furthermore, the parallel two-color (PTC) laser pulse is a useful instrument for controlling the process of recollision in a strong laser field. In this paper, with the aim of investigating the role of ionization mechanisms governing the NSDI of argon atoms, we use a PTC laser pulse with wavelengths of 2400 nm and 1200 nm to control the motion of two electrons. We investigate the contribution of ionization mechanisms as well as the correlation dynamics of two electrons upon the change in relative phase between the two component lasers from 0 to 2π. Method: The two-dimensional classical ensemble model is used to simulate the NSDI process, in which the motion of two electrons is governed by Newton's law. Results: The correlated two-electron momentum distribution, recolliding time, and energy distribution after the returning electron's recolliding moment are extraordinarily sensitive to the relative phase of the two lasers. To modulate the ionization mechanisms, the relative phase between two lasers is tuned. Conclusion:The results demonstrate that parallel two-color laser pulses are an effective method of controlling the correlated electron dynamics in nonsequential double ionization.

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“…Additionally, the constant a also influences the high-order harmonic generation (HHG) spectrum and other characteristics extracted for the He atom. It is worth noting that the investigation of the soft-core potential constant has been limited to only a few studies [54].…”

Section: Introductionmentioning

confidence: 99%

High-order harmonic generation, attosecond pulse, and non-sequential double ionization in the helium atom under high-intensity femtosecond laser pulses

Zakavi,

Sabaeian

2023

Phys. Scr.

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High-order harmonic generation (HHG), attosecond pulse train (APT), isolated attosecond pulse (IAP), and non-sequential double ionization (NSDI) in the Helium atom under intense femtosecond laser pulses are computed using the time-dependent Schrodinger equation (TDSE) in one dimension (1D). By taking into account the electron-electron and electron-nucleus interactions, as well as determining the Helium atom's ground state wave function through the imaginary time propagation (ITP) method, we are able to observe the widely recognized "knee structure" in the ionization probability of the Helium atom as a function of intensity within an ionization boundary condition model. The results are in good agreement with the experimental data reported by Walker et al. [B. Walker et al. Phys. Rev. Lett. 73, 1227 (1994)].

show abstract

Soft parameters in Coulomb potential of noble atoms for nonsequential double ionization: Classical ensemble model and simulations

Cited by 6 publications

References 33 publications

High-order harmonic generation, attosecond pulse train, and non- sequential double ionization in the helium atom under high-intensity femtosecond laser pulses

High-order harmonic generation, attosecond pulse train, and non- sequential double ionization in the helium atom under high-intensity femtosecond laser pulses

Controlling nonsequential double ionization mechanisms of argon atoms by parallel two-color laser pulses

High-order harmonic generation, attosecond pulse, and non-sequential double ionization in the helium atom under high-intensity femtosecond laser pulses

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