A doubly distorted-wave method for atomic ionization by ultrashort laser pulses

Gravielle, M. S.; Arbó, D. G.; Miraglia, J. E.; Ciappina, M. F.

doi:10.1088/0953-4075/45/1/015601

Cited by 10 publications

(11 citation statements)

References 42 publications

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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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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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“…A wealth of information is encoded in this high-energy above-threshold ionization part of the photoelectron spectra about both (i) the driving laser field and (ii) the structure of the target [30,31] (via its scattering cross section [32,33]). Moreover, high-energy above-threshold ionization is more robustly accessible to theoretical modeling than the low-energy part of photoelectron spectra, which is plagued by the necessity to take Coulomb corrections into account [34][35][36][37][38][39].…”

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confidence: 99%

Two-Color Strong-Field Photoelectron Spectroscopy and the Phase of the Phase

et al. 2015

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The presence of a weak second-harmonic field in an intense-laser ionization experiment affects the momentum-resolved electron yield, depending on the relative phase between the ω and the 2ω component. The proposed two-color "phase-of-the-phase spectroscopy" quantifies for each final electron momentum a relative-phase contrast (RPC) and a phase of the phase (PP) describing how much and with which phase lag, respectively, the yield changes as a function of the relative phase. Experimental results for RPC and PP spectra for rare gas atoms and CO_{2} are presented. The spectra demonstrate a rather universal structure that is analyzed with the help of a simple model based on electron trajectories, wave-packet spreading, and (multiple) rescattering. Details in the PP and RPC spectra are target sensitive and, thus, may be used to extract structural (or even dynamical) information with high accuracy.

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“…, which simply consists of the product of a Coulomb state and the Volkov phase, cannot account for this effect [11,44]. Effectively it has been shown that the introduction of the quiver motion provides better results [48]. Since it accounts for the KH frame, i.e.…”

Section: A Comparison Of the Various Wave Functionsmentioning

confidence: 99%

Theoretical derivation of laser-dressed atomic states by using a fractal space

Duchateau

2018

Eur. Phys. J. Plus

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The derivation of approximate wave functions for an electron submitted to both a coulomb and a time-dependent laser electric fields, the so-called Coulomb-Volkov (CV) state, is addressed. Despite its derivation for continuum states does not exhibit any particular problem within the framework of the standard theory of quantum mechanics (QM), difficulties arise when considering an initially bound atomic state. Indeed the natural way of translating the unperturbed momentum by the laser vector potential is no longer possible since a bound state does not exhibit a plane wave form including explicitely a momentum. The use of a fractal space permits to naturally define a momentum for a bound wave function. Within this framework, it is shown how the derivation of laser-dressed bound states can be performed. Based on a generalized eikonal approach, a new expression for the laser-dressed states is also derived, fully symmetric relative to the continuum or bound nature of the initial unperturbed wave function. It includes an additional crossed term in the Volkov phase which was not obtained within the standard theory of quantum mechanics. The derivations within this fractal framework have highlighted other possible ways to derive approximate laserdressed states in QM. After comparing the various obtained wave functions, an application to the prediction of the ionization probability of hydrogen targets by attosecond XUV pulses within the sudden approximation is provided. This approach allows to make predictions in various regimes depending on the laser intensity, going from the non-resonant multiphoton absorption to tunneling and barrier-suppression ionization.

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A doubly distorted-wave method for atomic ionization by ultrashort laser pulses

Cited by 10 publications

References 42 publications

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

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

Two-Color Strong-Field Photoelectron Spectroscopy and the Phase of the Phase

Theoretical derivation of laser-dressed atomic states by using a fractal space

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