Effect of bound electron wave packet displacement on the multiphoton ionization of a lithium atom

Jheng, Shih Da; Jiang, Tsin-Fu

doi:10.1088/1361-6455/aa8968

Cited by 7 publications

(4 citation statements)

References 35 publications

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“…This is an indication for a twophoton population transfer, thus explaining the I 2 0 scaling. Similar theoretical studies have also reported such oscillations of final states with respect to the intensity and time for alkali atoms [30,31,34].…”

Section: Non-resonant Two-photon Ionization At 511 Nmsupporting

confidence: 75%

Absolute strong-field ionization probabilities of ultracold rubidium atoms

et al. 2018

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We report on precise measurements of absolute nonlinear ionization probabilities obtained by exposing optically trapped ultracold rubidium atoms to the field of an ultrashort laser pulse in the intensity range of 1 × 10 11 to 4 × 10 13 W/cm 2 . The experimental data are in perfect agreement with ab-initio theory, based on solving the time-dependent Schrödinger equation without any free parameters. Ultracold targets allow to retrieve absolute probabilities since ionized atoms become apparent as a local vacancy imprinted into the target density, which is recorded simultaneously. We study the strong-field response of 87 Rb atoms at two different wavelengths representing non-resonant and resonant processes in the demanding regime where the Keldysh parameter is close to unity.

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Section: Non-resonant Two-photon Ionization At 511 Nmsupporting

confidence: 75%

Absolute strong-field ionization probabilities of ultracold rubidium atoms

et al. 2018

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“…A lithium (Li) atom, being the simplest open-shell system, presents itself a unique target for laser-atom interaction investigations, drawing both experimental [6,7] and theoretical [8][9][10][11][12][13] attention. From a theoretical perspective, it is important that the lithium atom has a single electron outside a closed shell, which enables the single-active-electron (SAE) model to come into play for an accurate description of the electron dynamics [7,10,12]. For all the laser pulse parameters considered in the present paper, it is well established that the timedependent Schrödinger equation within the SAE formulation is adequate for describing the ionization process [7].…”

Section: Introductionmentioning

confidence: 99%

Photoelectron spectra after multiphoton ionization of Li atoms in the one-photon Rabi-flopping regime

et al. 2019

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We calculate two-dimensional photoelectron momentum distributions and energy spectra after multiphoton ionization of Li atoms subject to intense laser fields in one-photon Rabi-flopping regime. The time-dependent Schrödinger equation is solved within the single-active-electron approximation using a model potential which reproduces accurately the binding energies and dipole matrix elements of the Li atom. Interaction with the external electromagnetic field is treated within the dipole approximation. We show that the Rabi oscillations of the population between the ground 2s state and the excited 2p state in the one-photon resonance regime are reflected in the energy spectra of emitted photoelectrons which manifest interference structures with minima. Transformations of the interference structures in the photoelectron energy spectra caused by the variation of the laser peak intensity and pulse duration are analyzed.

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“…In this work, we study the three-photon ionization of atomic lithium [56][57][58][59] by numerically solving the TDSE of its valence electron. In particular, we consider the 2+1 photon ionization of Li by inducing two-photon Rabi oscillations between the 2s ground state and the 4s excited level (figure 1).…”

Section: Introductionmentioning

confidence: 99%

Competition of multiphoton ionization pathways in lithium

Tóth,

Csehi

2024

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

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We study the three-photon ionization of atomic lithium by intense, short light pulses, via numerically solving the time-dependent Schrodinger equation. Two-photon Rabi oscillations are induced between the 2s and 4s states, which are damped due to single-photon ionization to the p continuum. Developing a minimal three-level model, we analyze the spectral features of the Autler-Townes (AT) doublet that is formed upon the resonant coupling with the laser pulse. Furthermore, we show that this 2s -- 4s - p continuum pathway is the dominant process, if the duration of the laser pulse exceeds a certain value. For shorter pulses, ionization through the 2p state (2s - 2p - 4d - f continuum) gradually becomes the dominant process, provided that the pulse is strong enough to induce several Rabi ﬂoppings. Here we trace the competition of these ionization pathways by observing the structural changes in the shape of the AT doublet.

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Effect of bound electron wave packet displacement on the multiphoton ionization of a lithium atom

Cited by 7 publications

References 35 publications

Absolute strong-field ionization probabilities of ultracold rubidium atoms

Absolute strong-field ionization probabilities of ultracold rubidium atoms

Photoelectron spectra after multiphoton ionization of Li atoms in the one-photon Rabi-flopping regime

Competition of multiphoton ionization pathways in lithium

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