Coulomb-Volkov approximation for near-threshold ionization by short laser pulses

Arbó, D. G.; Miraglia, J. E.; Gravielle, M. S.; Schiessl, K.; Persson, Emil; Burgdörfer, Joachim

doi:10.1103/physreva.77.013401

Cited by 117 publications

(134 citation statements)

References 50 publications

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“…Thus the dominant final state for the first ATI peak has the angular momentum quantum number of 5. The pattern of the energy-angular distribution and the stripe number of the first ring are in good agreement with those in the literature [15,18,63]. As for the fine structures, one kind of explanation is that they are produced by the rapidly changing ponderomotive potential in the short laser pulse [16].…”

Section: B Multiphoton Above-threshold Ionization Of Hydrogen Atom Isupporting

confidence: 77%

“…These stripes are induced by the long-range Coulomb potential and are related to the fact that the ATI peak is determined by one dominant partial wave in the final state [15,17]. The number of the stripes equals the angular momentum quantum number of the dominant partial wave in the final state plus one [15,17,18,63]. In Fig.…”

Section: B Multiphoton Above-threshold Ionization Of Hydrogen Atom Imentioning

confidence: 99%

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Precision calculation of above-threshold multiphoton ionization in intense short-wavelength laser fields: The momentum-space approach and time-dependent generalized pseudospectral method

Zhou

Chu

2011

Phys. Rev. A

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We present an approach in momentum (P) space for the accurate study of multiphoton and above-threshold ionization (ATI) dynamics of atomic systems driven by intense laser fields. In this approach, the electron wave function is calculated by solving the P-space time-dependent Schrödinger equation (TDSE) in a finite P-space volume under a simple zero asymptotic boundary condition. The P-space TDSE is propagated accurately and efficiently by means of the time-dependent generalized pseudospectral method with optimal momentum grid discretization and a split-operator time propagator in the energy representation. The differential ionization probabilities are calculated directly from the continuum-state wave function obtained by projecting the total electron wave function onto the continuum-state subspace using the projection operator constructed by the continuum eigenfunctions of the unperturbed Hamiltonian. As a case study, we apply this approach to the nonperturbative study of the multiphoton and ATI dynamics of a hydrogen atom exposed to intense shortwavelength laser fields. High-resolution photoelectron energy-angular distribution and ATI spectra have been obtained. We find that with the increase of the laser intensity, the photoelectron energy-angular distribution changes from circular to dumbbell shaped and is squeezed along the laser field direction. We also explore the change of the maximum photoelectron energy with laser intensity and strong-field atomic stabilization phenomenon in detail.

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Section: B Multiphoton Above-threshold Ionization Of Hydrogen Atom Isupporting

confidence: 77%

Section: B Multiphoton Above-threshold Ionization Of Hydrogen Atom Imentioning

confidence: 99%

Precision calculation of above-threshold multiphoton ionization in intense short-wavelength laser fields: The momentum-space approach and time-dependent generalized pseudospectral method

Zhou

Chu

2011

Phys. Rev. A

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“…(8) has been widely used to describe the emitted electron immersed in the laser field. For example the Strong Field Approximation (SFA) [12,13,17,22], the Coulomb-Volkov Approximation (CVA) [5,8,11,15,23] and the semiclassical application of the Simple Man's Model (SCM) [3,4,6] employ the non-stationary Volkov state as final wavefunction. The use of length gauge for the perturbation potential, i.e.…”

Section: Above Threshold Ionizationmentioning

confidence: 99%

Nonconstant ponderomotive energy in above-threshold ionization by intense short laser pulses

et al. 2016

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We analyze the contribution of the quiver kinetic energy acquired by an electron in an oscillating electric field to the energy balance in atomic ionization processes by a short laser pulse. Due to the time dependence of this additional kinetic energy, a temporal average is assumed to maintain a stationary energy conservation rule. This rule is used to predict the position of the peaks observed in the photo electron spectra (PE). For a flat top pulse envelope, the mean value of the quiver energy over the whole pulse leads to the concept of ponderomotive energy Up. However for a short pulse with a fast changing field intensity a stationarity approximation could not be precise.We check these concepts by studying first the photoelectron (PE) spectrum within the Semiclassical Model (SCM) for a multiple steps pulses. The SCM offers the possibility to establish a connection between emission times and the PE spectrum in the energy domain. We show that PE substructures stem from ionization at different times mapping the pulse envelope. We also present the analysis of the PE spectrum for a realistic sine-squared envelope within the Coulomb-Volkov and ab initio calculations solving the time-dependent Schrödinger equation. We found that the electron emission amplitudes produced at different times interfere with each other and produce a new additional pattern, that overlap the above-threshold ionization (ATI) peaks.

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“…In the past two decades, strong-field ionization of atomic targets has been studied widely both in theoretical calculations and in experiments [1][2][3][4][5][6][7][8][9]. Most of the experiments have focused on rare-gas atoms whose ionization potential I p = 12-25 eV, with the laser wavelength centered around 800 nm.…”

Section: Introductionmentioning

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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Coulomb-Volkov approximation for near-threshold ionization by short laser pulses

Cited by 117 publications

References 50 publications

Precision calculation of above-threshold multiphoton ionization in intense short-wavelength laser fields: The momentum-space approach and time-dependent generalized pseudospectral method

Precision calculation of above-threshold multiphoton ionization in intense short-wavelength laser fields: The momentum-space approach and time-dependent generalized pseudospectral method

Nonconstant ponderomotive energy in above-threshold ionization by intense short laser pulses

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

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