Multiphoton ionization of hydrogen by a strong multimode field

Basile, Salvatore; Trombetta, F.; Ferrante, G.; Burlon, R.; Leone, Cláudio

doi:10.1103/physreva.37.1050

Cited by 50 publications

(16 citation statements)

References 14 publications

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“…For example, in the SFA (first derived within the Keldysh-Faisal-Reiss theory [38][39][40]) |χ − f (t) is represented by Volkov states [41], which neglect the influence of the ionic core potential on the outgoing electron. Alternatively we have performed calculations in the Coulomb-Volkov approximation (CVA), which was first proposed by Jain and Tzoar [42] and extensively used for ionization by monochromatic low-intensity lasers [39,40,[43][44][45][46]. In the CVA, |χ − f (t) contains both the phase of the Volkov state as well as the Coulomb continuum state of the field-free atom.…”

Section: Distorted-wave Approximationsmentioning

confidence: 99%

Ionization of argon by two-color laser pulses with coherent phase control

Arbó¹,

Lemell²,

Nagele³

et al. 2015

Phys. Rev. A

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We present a joint experimental and theoretical study of ionization of argon atoms by a linearly polarized two-color laser field (λ 1 = 800 nm, λ 2 = 400 nm). Changing the relative phase ϕ between the two colors, the forward-backward asymmetry of the doubly differential momentum distribution of emitted electrons can be controlled. We find excellent agreement between the measurements and the solution of the time-dependent Schrödinger equation in the single-active electron approximation. Surprisingly we also find good agreement between the quantum and classical calculations of electron momentum distributions generated by lasers at optical wavelengths.

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Section: Distorted-wave Approximationsmentioning

confidence: 99%

Ionization of argon by two-color laser pulses with coherent phase control

Arbó¹,

Lemell²,

Nagele³

et al. 2015

Phys. Rev. A

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“…A similar approach has already been introduced a long time ago by Jain and Tzoar [3]. The method was ex amined in various situations (stationary laser beams, low frequency photons) which differ completely from the physical conditions of ultra-short X-UV laser pulses (see, e.g., [7,8] and references therein). In the present paper, we investigate to which exte nt a similar perturbation Coulomb -Volkov approach may be employed to predict single ionization of atoms or molecules by high -frequency photons of a short laser pulse.…”

Section: Introductionmentioning

confidence: 99%

Coulomb-Volkov approach of ionization by extreme-ultraviolet laser pulses in the subfemtosecond regime

2002

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In conditions where the interaction betweeen an atom and a short high -frequency extreme ultraviolet laser pulse is a perturbation, we show that a simple theoret ical approach, based on Coulomb-Volkov-type states, can make reliable predictions for ionization. To avoid any additional approximation, we consider here a standard case : the ionization of hydrogen atoms initially in their ground state. For any field para meter, we show that the method provides accurate energy spectra of ejected electrons, including many above threshold ionization peaks, as long as the two following conditions are simultaneously fulfilled : (i) the photon energy is greater than or equal to the ionization potential ; (ii) the ionization process is not saturated.Thus, ionization of atoms or molecules by the high -harmonics laser pulses which are generated at present may be addressed through this Coulomb-Volkov treatment.3

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“…The original paper of Keldysh [15], as well as those on the same line of thought [16], neglected the Coulomb interaction of the ejected electron. Recently, the authors have proposed a new version of this approach [17] including the interaction between the photoelectron and the residual ion, which reproduce some qualitative features of the experimental results of the ATI [18]. The qualitative analysis reported in ref.…”

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confidence: 60%

Simultaneous multiphoton ionization by two radiation fields. Effects of the statistical properties of the radiation

1991

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Summary.--We report on calculations of differential and total ionization crosssections of hydrogen atoms irradiated by two radiation fields with different properties. One of the fields is of low intensity and relatively high frequency, the other is of low frequency and high intensity. In particular, we show that the inclusion of the multimode structure of the low-frequency laser field modifies considerably the shape of the angular distribution of the photoelectrons and the rates of ionization into the different channels characterized by the number of low-frequency photons exchanged. Further, we find that the average energy exchanged between the photoelectrons and the low-frequency radiation field is independent of the statistical properties of the low-frequency laser field.PACS 32.80 -Photon interactions with atoms.

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Multiphoton ionization of hydrogen by a strong multimode field

Cited by 50 publications

References 14 publications

Ionization of argon by two-color laser pulses with coherent phase control

Ionization of argon by two-color laser pulses with coherent phase control

Coulomb-Volkov approach of ionization by extreme-ultraviolet laser pulses in the subfemtosecond regime

Simultaneous multiphoton ionization by two radiation fields. Effects of the statistical properties of the radiation

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