Multiple absorption of laser photons by atoms

Faisal, Farhard

doi:10.1088/0022-3700/6/4/011

Cited by 1,077 publications

(445 citation statements)

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“…or Keldysh-Faisal-Reiss approximation [29][30][31]; for an introductory review see [32]. This simple picture is very useful in explaining the experiment, although it is strictly true only in length gauge [33][34][35].…”

Section: The Tunneling Timementioning

confidence: 99%

How to understand the tunneling in attosecond experiment?

Kullie

2018

Annals of Physics

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The measurement of the tunneling time (T-time) in today's attosecond and strong field (low-frequency) experiments, despite its controversial discussion, offers a fruitful opportunity to understand time measurement and the time in quantum mechanics. In addition, as we will see in this work, a related controversial issue is the particulate nature of the radiation. Different models used to calculate the T-time will be discussed in this work in relation to my model of real T-time, Phys. Rev. 92, 052118 (2015), where an intriguing similarity to the Bohr-Einstein photon box Gedanken experiment was found. The tunneling process itself is still not well understood, but I am arguing that a scattering mechanism (by the laser wave packet) offers a possibility to understand the tunneling process in the tunneling region. This is related to the question about the corpuscular nature of light which is widely discussed in modern quantum optics experiments.Keywords: Attosecond physics, tunneling time and time measurement in attosecond experiments, timeenergy uncertainty relation, time and time-operator in quantum mechanics, Bohr-Einstein's photon box Gedanken experiment, multiphoton processing, Compton scattering, wave-particle duality. I. INTRODUCTIONThere is no doubt that the advent of 'attophysics' opens new perspectives in the study of time resolved phenomena in atomic and molecular physics [1][2][3][4][5] A similar controversial issue to the time issue (and the T-time and TEUR) is the wave-matter duality and the partic-

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Section: The Tunneling Timementioning

confidence: 99%

How to understand the tunneling in attosecond experiment?

Kullie

2018

Annals of Physics

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“…Within the limits of the S-matrix theory of photoionization we can do it in the following way. The general analytical expressions for ionization rate of the spherically symmetric initial state in the strong-field approximation (SFA) [6,7] are…”

Section: Kfr Theory In Finite Spatial Regionmentioning

confidence: 99%

“…In Sect. 2 we derive strong-field ionization rates (in the version of Faisal-Reiss [6,7]) in finite spatial region and compare them numerically with standard results. Based on the comparisons we propose new Coulomb correction to the Volkov wavefunction and we calculate ionization rates resulting from the correction in Sect.…”

Section: Introductionmentioning

confidence: 99%

“…In 1994 Reiss and Krainov published the paper entitled "Approximation for a Coulomb-Volkov solution in strong fields" [1], where the well-known Volkov (or Gordon-Volkov) wave function [2,3], multiplied by a time-dependent exponential factor, has been used as a final state in the Keldysh-Faisal-Reiss (KFR) theory [4][5][6][7][8]. Although this Coulomb correction is remarkably simple (and resolves itself into a small shift of the binding energy of the H(1s) atom), it can increase the calculated ionization rate by a few orders of magnitude (see, for example, Fig.…”

Section: Introductionmentioning

confidence: 99%

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The Spatial Region of Photoionization in a Strong Laser Field

Bauer

2008

Acta Phys. Pol. A

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In the framework of the Keldysh-Faisal-Reiss theory in the velocity gauge we investigate the magnitude of the space region, where photoionization in a strong laser field takes place. We find substantial differences between the short-range and the long-range (Coulomb) potentials, and between linear and circular polarizations of incident radiation. It appears that only for the initial state in the Coulomb potential the region of space, where ionization is held, expands significantly with increasing intensity for a typical optical frequency and non-relativistic but strong circularly polarized laser field. As a result of our considerations, we suggest to modify the idea of Reiss and Krainov of a certain simple Coulomb correction to the Volkov wave function. We show that photoionization rate calculated for the H(1s) atom, using our approach, is in better agreement with other theoretical results for moderately strong circularly polarized laser field.

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“…[12][13][14] The application of strong pulses to atoms has a long history. [15][16][17][18][19][20][21][22][23][24][25] Here we are interested in non-ionizing effects, which require the use of moderately-strong pulses, typically within tens of TW/cm 2 . Thomas George and Andre Bandrauk developed a very useful "chemical" picture of light-induced events.…”

Section: Introductionmentioning

confidence: 99%

Molecular events in the light of strong fields: A light‐induced potential scenario

Chang

Solá

Shin

2016

Int J of Quantum Chemistry

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A new perspective on how to manipulate molecules by means of very strong laser pulses is emerging with insights from the so-called light-induced potentials, which are the adiabatic potential energy surfaces of molecules severely distorted by the effect of the strong field. Different effects appear depending on how the laser frequency is tuned, to a certain electronic transition, creating light-induced avoided crossings, or very off-resonant, generating Stark shifts. In the former case it is possible to induce dramatic changes in the geometry and redistribution of charges in the molecule while the lasers are acting and to fully control photodissociation reactions as well as other photochemical processes. Several theoretical proposals taken from the work of the authors are reviewed and analyzed showing the unique features that the strong-laser chemistry opens to control the transient properties and the dynamics of molecules.

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Multiple absorption of laser photons by atoms

Cited by 1,077 publications

References 2 publications

How to understand the tunneling in attosecond experiment?

How to understand the tunneling in attosecond experiment?

The Spatial Region of Photoionization in a Strong Laser Field

Molecular events in the light of strong fields: A light‐induced potential scenario

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