Atomic RABBITT-like experiments framed as diatomic molecules

Boll, D. I. R.; Fojón, O A

doi:10.1088/0953-4075/49/18/185601

Cited by 12 publications

(16 citation statements)

References 35 publications

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“…For completeness we note that the present semiclassical description of the interhalf-cycle interference factor allows also for an alternative intuitive interpretation following Ref. [23].…”

Section: Izationmentioning

confidence: 77%

“…The relative phase between these two ionization paths permits the interferometric extraction of phase shifts and time delays from the asymptotic behavior of the scattered electron wave packet. Accurate phase and time information can be directly extracted from numerically exact solutions of the time-dependent Schrödinger equation (TDSE) [17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Semiclassical strong-field theory of phase delays in $ω-2ω$ above-threshold ionization

Arbó¹,

López²,

Burgdörfer³

2022

Preprint

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Phase and time delays of atomic above-threshold ionization were recently experimentally explored in an ω − 2ω setting [Zipp et al, Optica 1, 361 (2014)]. The phases of wavepackets ejected from argon by a strong 2ω pulse were probed as a function of the relative phase of a weaker ω probe pulse. Numerical simulations solving the time-dependent Schrödinger equation (TDSE) displayed a sensitive dependence of the doubly differential momentum distribution on the relative phase between the ω and 2ω fields. Moreover, a surprisingly strong variation of the extracted phase delays on the intensity of the probe pulse was found. We present a semiclassical strong-field description of the phase delays in the emission of electrons in an ω − 2ω setting and apply it to atomic hydrogen. Non-perturbative effects in both the 2ω pump and the ω probe field are included. The semiclassical description allows tracing phase delays to path interferences between emission during different points in time of emission within the temporal unit cell of the two-color laser field. We find good agreement between the semiclassical saddle-point approximation, the full strong field approximation (SFA), and previous results applicable in the perturbative limit of probe fields. We show that the RABBIT-like perturbative description of phase delays breaks down for stronger fields and higher-energy electron emission. In this regime, characterization of the ionization signal requires an entire ensemble of phase delays δ i (E) with i = 1, 2, . . . the difference in photon numbers of the strong 2ω field involved in the interfering paths. Comparison between SFA and TDSE calculations reveals the influence of the Coulomb field even in this strong-field scenario.

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“…For completeness we note that the present semiclassical description of the interhalf-cycle interference factor allows also for an alternative intuitive interpretation following Ref. [23].…”

Section: Izationmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Semiclassical strong-field theory of phase delays in $ω-2ω$ above-threshold ionization

Arbó¹,

López²,

Burgdörfer³

2022

Preprint

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“…The SFA is regularly used in description of the sidebands of the main photoelectron line in XUV + IR ionization by atto-and femtosecond pulses (Kazansky et al, 2010(Kazansky et al, , 2011Jiménez Galán et al, 2013;Picard et al, 2004). It allows significant advances in developing analytical derivations, in particular, closed-form expressions for the angular distributions of photoelectrons in two-colour XUV + IR ionization were obtained (Boll and Fojón, 2016).…”

Section: Strong-field-type Approximationsmentioning

confidence: 99%

Atomic, molecular and optical physics applications of longitudinally coherent and narrow bandwidth Free-Electron Lasers

Callegari,

Grum-Grzhimailo,

Ishikawa

et al. 2020

Preprint

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Short wavelength Free-Electron Lasers (FELs) are the newest light sources available to scientists to probe a wide range of phenomena, with chemical, physical and biological applications, using soft and hard X-rays. These sources include the currently most powerful light sources in the world (hard X-ray sources) and are characterised by extremely high powers and high transverse coherence, but the first FELs had reduced longitudinal coherence. Now it is possible to achieve good longitudinal coherence (narrow bandwidth in the frequency domain) and here we discuss and illustrate a range of experiments utilising this property, and their underlying physics. The primary applications are those which require high resolution (for example resonant experiments), or temporal coherence (for example coherent control experiments). The currently available light sources extend the vast range of laboratory laser techniques to short wavelengths.

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“…(2)) takes into account the Coulomb interaction of the electron with the residual target in the final channel of the reaction. It was shown that this interaction must be accounted for to describe the photoionization reaction with neutral targets in a realistic way [1, 13,14].…”

Section: Theory I Coulomb Continuum (Cc) Modelmentioning

confidence: 99%

Photoionization of water molecules by high energy photons

2017

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We theoretically study the photoionization of water molecules by high energy photon impact. We develop a model in which the final state wavefunction is given by a Coulomb continuum wavefunction with effective charges and the water molecule bound states are represented using the Moccia's monocentric wavefunctions. We obtain analytical expressions for the transition matrix element that enable the computation of cross sections by numerical quadratures. We compare our predictions for photon energies between 20 and 300 eV with more elaborated theoretical results and experiments. We obtain a very good agreement with experiments, in particular, at enough high energies where there is a lack of elaborated results due to their high computational cost.

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Atomic RABBITT-like experiments framed as diatomic molecules

Cited by 12 publications

References 35 publications

Semiclassical strong-field theory of phase delays in $ω-2ω$ above-threshold ionization

Semiclassical strong-field theory of phase delays in $ω-2ω$ above-threshold ionization

Atomic, molecular and optical physics applications of longitudinally coherent and narrow bandwidth Free-Electron Lasers

Photoionization of water molecules by high energy photons

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