Interference effect of photoionization of hydrogen atoms by ultra-short and ultra-fast high-frequency chirped pulses*

Wang, Ningyue; Liu, Aihua

doi:10.1088/1674-1056/28/8/083403

Cited by 8 publications

(6 citation statements)

References 35 publications

(64 reference statements)

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“…After all, it became clear that ground state atoms exhibit dynamic interference, the onset of which can be considered as a signature of atomic stabilization [39]. Over the past years, further theoretical works have demonstrated the importance of dynamic interference from different perspectives [41][42][43][44][45][46][47], though an experimental realization is yet to be presented.…”

Section: Introductionmentioning

confidence: 99%

Probing strong-field two-photon transitions through dynamic interference

Tóth¹,

Csehi²

2021

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

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We demonstrate how strong-field multiphoton transitions between dynamically shifted atomic levels can be traced in the energy spectra of emitted photoelectrons. Applying an ultrafast and intense laser pulse, two-photon Rabi oscillations are induced between two bound states of an atom. A third photon from the same pulse directly ionizes the atom, thus the emitted photoelectrons coherently probe the underlying dynamics. As the instantaneous energy of photoelectrons follows the pulse intensity envelope, modulated by the ac Stark shifts, electrons emitted with the same energy but at different times—at the rising and falling edge of the pulse—will interfere leading to pronounced dynamic interference pattern in the spectra. We investigate this phenomenon both numerically and analytically by developing a minimal three-state model that incorporates two-photon coupling and dynamically shifted atomic levels. On the example of atomic lithium (2s → → 4s → continuum) we show how the individual ac Stark shifts and the two-photon Rabi frequency are reflected through the asymmetry, shifting and splitting of the interference structure of the computed photopeaks.

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Section: Introductionmentioning

confidence: 99%

Probing strong-field two-photon transitions through dynamic interference

Tóth¹,

Csehi²

2021

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

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“…Unfortunately, there are minor faults or typos in their models Demekhin et al [13], and Demekhin and Cederbaum [10] and Baghery et al [9] gave contradicting conclusions. However, the time-dependent Schrödinger equation (TDSE) fully numerical solution corroborated some predictions of dynamic interference in photoemission by powerful extreme ultraviolet (XUV) linearly polarized pulses Guo et al [12]; Jiang and Burgdörfer [7]; Wang et al [14]; Wang and Liu [15].…”

Section: Introductionmentioning

confidence: 72%

Photoelectron momentum distribution of hydrogen atoms in a superintense ultrashort high-frequency pulse

Wang

Liu

et al. 2022

Front. Phys.

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We use a numerically solved time-dependent Schrödinger equation for calculating the photoelectron momentum distribution of ground-state hydrogen atoms in the presence of superintense ultrashort high-frequency pulses. It is demonstrated that the dynamic interference effect within a superintense XUV laser beam has the ability to significantly alter the photoelectron momentum distribution. In our work, a clearly visible dynamic interference pattern is observed when hydrogen atoms are exposed to a superintense circularly polarized laser pulse with a photon energy of ℏω = 53.605 eV, which has previously been found for linearly polarized pulses or the weakly bounded model H− system for circularly polarized pulses. Angular-distorted interference arises for linear superintense XUV pulses of similar intensity. The significant differences in photoelectron momentum distributions that have been seen by linearly and circularly polarized XUV pulses are caused by the Coulomb rescattering phenomenon.

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“…[1][2][3] The representative nonlinear processes include nonsequential double ionization, [4][5][6] high-order harmonic generation (HHG), [7][8][9][10] and dynamic interference (DI) in atomic ionization. [11][12][13][14] To fully understand these strong-field phenomena, not only sophisticated experimental technologies are required, but stateof-the-art numerical methods are also indispensable. The most accurate way to numerically reproduce the experimental data is, of course, performing calculations from first principles, i.e., directly solving the full-dimensional (FD) time-dependent Schrödinger equation (TDSE) that strictly describes the timedependent system.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of photoionization of atomic hydrogen by solving the one- and three-dimensional time-dependent Schrödinger equations*

Wang¹,

Khan²,

Tian³

et al. 2021

Chinese Phys. B

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We develop a numerical scheme for solving the one-dimensional (1D) time-dependent Schrödinger equation (TDSE), and use it to study the strong-field photoionization of the atomic hydrogen. The photoelectron energy spectra obtained for pulses ranging from XUV to near infrared are compared in detail to the spectra calculated with our well-developed code for accurately solving the three-dimensional (3D) TDSE. For XUV pulses, our discussions cover intensities at which the ionization is in the perturbative and nonperturbative regimes. For pulses of 400 nm or longer wavelengths, we distinguish the multiphoton and tunneling regimes. Similarities and discrepancies between the 1D and 3D calculations in each regime are discussed. The observed discrepancies mainly originate from the differences in the transition matrix elements and the energy level structures created in the 1D and 3D calculations.

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Interference effect of photoionization of hydrogen atoms by ultra-short and ultra-fast high-frequency chirped pulses*

Cited by 8 publications

References 35 publications

Probing strong-field two-photon transitions through dynamic interference

Probing strong-field two-photon transitions through dynamic interference

Photoelectron momentum distribution of hydrogen atoms in a superintense ultrashort high-frequency pulse

Comparative study of photoionization of atomic hydrogen by solving the one- and three-dimensional time-dependent Schrödinger equations*

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