Interference substructure of above-threshold ionization peaks in the stabilization regime

Toyota, Koudai; Tolstikhin, Oleg I.; Morishita, Tōru; Watanabe, Shinichi

doi:10.1103/physreva.78.033432

Cited by 43 publications

(44 citation statements)

References 37 publications

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“…Here, the exciting pulse creates a coherent superposition of the initial and resonant states which is superimposed with the autoionization continuum. If the corresponding Rabi-frequency is made larger than the autoionization width, the photoelectron spectrum exhibits a multiplepeak structure [13,14] which is owing to dynamic interference [15][16][17][18][19]. As a consequence, the profile-shape of the autoionizing resonance, observed in the weak-field limit, becomes significantly distorted.…”

Section: Introductionmentioning

confidence: 99%

Impact of intense laser pulses on the autoionization dynamics of the 2s2p doubly excited state of He

2017

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The photoionization of a helium atom by short intense laser pulses is studied theoretically in the vicinity of the 2s2p 1 P doubly-excited state with the intention to investigate the impact of the intensity and duration of the exciting pulse on the dynamics of the autoionization process. For that purpose, we solve numerically the corresponding time-dependent Schrödinger equation by applying the time-dependent restricted-active-space configuration-interaction method (TD-RASCI). The present numerical results clearly demonstrate that the Fano-interferences can be controlled by a single high-frequency pulse. As long as the pulse duration is comparable to the autoionization lifetime, varying the peak intensity of the pulse enables manipulation of the underlying Fano-interference. In particular, the asymmetric profile observed for the 2s2p 1 P doubly-excited state of He in the weak-field ionization can be smoothly transformed to a window-type interference profile.

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Section: Introductionmentioning

confidence: 99%

Impact of intense laser pulses on the autoionization dynamics of the 2s2p doubly excited state of He

2017

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“…In our opinion, KH-frame formulation is relevant only in the high-frequency limit of 1 with slowly varying envelope of the pulse, where higher order terms can be neglected [54,55]. Such conditions are satisfied for ionization of Rydberg states by IR lasers, or by simple atomic hydrogen or helium in the field of intense x rays.…”

Section: A the Formation Of Rydberg States In Strong-field Ionizatiomentioning

confidence: 99%

“…The theory of ionization suppression of Gavrila and coworkers [22,23], as well as the more recent works [54][55][56], was formulated in the oscillating frame of the laser field, or in the so-called KH frame. In this frame, for an atomic potential V (r), the TDSE takes the form…”

Section: A the Formation Of Rydberg States In Strong-field Ionizatiomentioning

confidence: 99%

Photoelectron spectra and high Rydberg states of lithium generated by intense lasers in the over-the-barrier ionization regime

Morishita

Lin

2013

Phys. Rev. A

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We calculated photoelectron energy and momentum spectra and the population of high Rydberg states of lithium atoms by intense 785 nm laser pulses at intensities in the over-the-barrier ionization (OBI) regime. The calculated spectra are compared to experiments reported in Schuricke et al. [Phys. Rev. A 83, 023413 (2011)]. It is shown that in the OBI regime, due to strong depletion of the ground state, the photoelectron spectra are generated from the leading edge of the laser pulse only, resulting in spectra that are nearly independent of laser intensities. Analysis of the calculated spectra reveals that total ionization probability is suppressed as the intensity is increased in the OBI regime. The suppression is due to the increase of excitation probability of high Rydberg states in the OBI regime, demonstrating that atoms and molecules are never fully ionized at high intensities. We also conclude that the interference stabilization model is not needed to explain the formation of high Rydberg states, and that there is no evidence that laser-dressed Kramers-Henneberger states play a role in the strong-field ionization of atoms and molecules by infrared lasers in the OBI regime.

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“…The PES in the directions π/6, π/3, and π/2 are also shown (for better visualization only 15 orders of magnitude are shown). Note, that a small peak around zero kinetic energy is observed [28,29]. However, the height of the peak might be underestimated, because due to our splitting approach the propagation time must be sufficiently large in order to detect all electrons of interest in the splitting region.…”

Section: Resultsmentioning

confidence: 99%

Wave-packet propagation based calculation of above-threshold ionization in the x-ray regime

Tilley

Karamatskou

Santra

2015

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

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We investigate the multi-photon process of above-threshold ionization for the light elements hydrogen, carbon, nitrogen and oxygen in the hard x-ray regime. Numerical challenges are discussed and by comparing Hartree-Fock-Slater calculations to configuration-interaction-singles results we justify the mean-field potential approach in this regime. We present a theoretical prediction of two-photon above-threshold-ionization cross sections for the mentioned elements. Moreover, we study how the importance of above-threshold ionization varies with intensity. We find that for carbon, at x-ray intensities around 10 23 Wcm −2 , two-photon above-threshold ionization of the K-shell electrons is as probable as one-photon ionization of the L-shell electrons.

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Interference substructure of above-threshold ionization peaks in the stabilization regime

Cited by 43 publications

References 37 publications

Impact of intense laser pulses on the autoionization dynamics of the 2s2p doubly excited state of He

Impact of intense laser pulses on the autoionization dynamics of the 2s2p doubly excited state of He

Photoelectron spectra and high Rydberg states of lithium generated by intense lasers in the over-the-barrier ionization regime

Wave-packet propagation based calculation of above-threshold ionization in the x-ray regime

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