Siegert-state expansion in the Kramers-Henneberger frame: Interference substructure of above-threshold ionization peaks in the stabilization regime

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

doi:10.1103/physreva.76.043418

Cited by 58 publications

(71 citation statements)

References 29 publications

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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%

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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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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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“…The complex-energy GamowSiegert states [53,59] states have been used in various contexts in nuclear, atomic, and molecular physics [60][61][62][63][64][65][66][67][68][69][70][71][72][73]. Some recent applications of Gamow-Siegert states, also in the context of a CC formalism relevant to the problem of dipole anions, can be found in, e.g., Refs.…”

Section: Introductionmentioning

confidence: 99%

Bound states of dipolar molecules studied with the Berggren expansion method

et al. 2013

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Bound states of dipole-bound negative anions are studied by using a non-adiabatic pseudopotential method and the Berggren expansion involving bound states, decaying resonant states, and nonresonant scattering continuum. The method is benchmarked by using the traditional technique of direct integration of coupled channel equations. A good agreement between the two methods has been found for well-bound states. For weakly-bound subthreshold states with binding energies comparable with rotational energies of the anion, the direct integration approach breaks down and the Berggren expansion method becomes the tool of choice.PACS numbers: 03.65. Nk, 33.15.Ry

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“…The formula quite similar to Eq. (24) was found in the study of the oscillating substructure in photon-absorption peaks in [7]. The difference is that our formula does not take into account the depletion of the ground state since Eq.…”

Section: F Spatial and Temporal Interference Of Photoelectron Wave Pmentioning

confidence: 91%

“…First, we revisit the oscillating substructure in photon-absorption peaks in the high-frequency regime, which has been recently studied by several groups [7][8][9][10]. In [7], they found the oscillating structure in the stabilization regime, and reconstructed it taking into account a spatial and temporal interference of photoelectron wave packets. However, their formulas were obtained in an empirical way, bringing a quasistatic picture into the HFFT.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal interference of photoelectron wave packets and the time scale of nonadiabatic transitions in the high-frequency regime

Toyota

2016

Phys. Rev. A

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The method of the envelope Hamiltonian [K. Toyota, U. Saalmann, and J. M. Rost, New J. Phys. 17, 073005 (2015)] is applied to further study a detachment dynamics of a model negative ion in one dimension in the high-frequency regime. This method is based on the Floquet approach, but the time dependency of an envelope function is explicitly kept for arbitrary pulse durations. Therefore, it is capable of describing not only a photon absorption or emission, but also a nonadiabatic transition which is induced by the time-varying envelope of the pulse. It was shown that the envelope Hamiltonian accurately retrieves the results obtained by the time-dependent Schrödinger equation, and the underlying physics were well understood by the adiabatic approximation based on the envelope Hamiltonian. In this paper, we explore two more aspects of the detachment dynamics, which were not considered in our previous work. First, we determine the features of both a spatial and temporal interference of photoelectron wave packets in a photon-absorption process. We conclude that both of the interference mechanisms are universal in ionization dynamics in the high-frequency regime. Second, we extract a pulse duration which maximizes a yield of the nonadiabatic transition as a function of a pulse duration. It is shown that it becomes maximum when the pulse duration is comparable to a time scale of an electron.

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Siegert-state expansion in the Kramers-Henneberger frame: Interference substructure of above-threshold ionization peaks in the stabilization regime

Cited by 58 publications

References 29 publications

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

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

Bound states of dipolar molecules studied with the Berggren expansion method

Spatiotemporal interference of photoelectron wave packets and the time scale of nonadiabatic transitions in the high-frequency regime

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