Attosecond evolution of energy- and angle-resolved photoemission spectra in two-color (XUV<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>+</mml:mo></mml:math>IR) ionization of rare gases

Picard, Y. J.; Manschwetus, Bastian; Géléoc, Marie; Böttcher, Martin; Casagrande, E M Staicu; Lin, Nan; Ruchon, Thierry; Carré, B.; Hergott, J.-F.; Lepetit, F.; Taïeb, Richard; Maquet, Alfred; Huetz, A.

doi:10.1103/physreva.89.031401

Cited by 14 publications

(45 citation statements)

References 21 publications

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“…For instance, the use of coincidence detection devices [32][33][34] typically requires about 10 5 -10 8 photons∕pulse [32], which matches the number of photons obtained in a single harmonic in the plateau when the short trajectory is phase matched with our sources. This opens the route to the investigation of, e.g., time delays in molecular photoionization [35].…”

Section: Resultsmentioning

confidence: 72%

Spatio-spectral structures in high harmonic generation driven by tightly focused high repetition rate lasers

et al. 2018

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We investigate the spatio-spectral properties of extreme ultraviolet (XUV) high harmonic radiation driven by high repetition rate femtosecond laser systems. In the spatio-spectral domain, ring-shaped structures at each harmonic order associated with long-trajectory electrons are found to form arrow-shaped structures at the cutoff. These structures are observed with two different laser systems: an optical parametric chirped-pulse amplifier system at a central wavelength of 1.55 μm and 125 kHz repetition rate, and a temporally compressed femtosecond ytterbium fiber amplifier at 1.03 μm wavelength and 100 kHz repetition rate. As recently pointed out, the observed structures are well explained by considering the space-time atomic dipole-induced phase for short and long electron trajectories in the generation plane. The tighter focusing geometry and longer wavelength associated with these emerging driving laser systems increase the ring-like divergence and spectral broadening for high harmonics. Cutoff energies and photon fluxes obtained in argon and neon are also reported. Overall, these results shed new light on the properties of XUV radiation driven by these recently developed high average power laser systems, paving the way to high photon-flux XUV beamlines.

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Section: Resultsmentioning

confidence: 72%

Spatio-spectral structures in high harmonic generation driven by tightly focused high repetition rate lasers

et al. 2018

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“…When an atom with ionization potential I p is ionized by an XUV attosecond pulse train (APT), photoelectrons are released in the continuum at discrete kinetic energies equal to E kin = E HH − I p , where E HH = (2 q +1) ħω defines the XUV photon energy comb of the APT ( ω is the IR laser frequency). When an IR dressing field is added, we obtain two-color two-photon transitions with a photoelectron spectrum that exhibits additional sidebands (SBs) at energies in-between two consecutive APT comb peaks 38 . These energies correspond to the absorption of an XUV photon combined with the additional absorption or emission of an IR photon.…”

Section: Resultsmentioning

confidence: 99%

“…However, as explained below, since it is based upon two-photon XUV-IR transitions, it also changes the angular momentum of the final states and consequently the photoelectron angular distributions. 38 , 47 . For any ionization channel leading to the same final state, our experimental measurement involves three two-photon pathways: 3 p → λ →ℓ, with ( λ , ℓ ) = (0,1),(2,1),(2,3).…”

Section: Discussionmentioning

confidence: 99%

Anisotropic photoemission time delays close to a Fano resonance

et al. 2018

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Electron correlation and multielectron effects are fundamental interactions that govern many physical and chemical processes in atomic, molecular and solid state systems. The process of autoionization, induced by resonant excitation of electrons into discrete states present in the spectral continuum of atomic and molecular targets, is mediated by electron correlation. Here we investigate the attosecond photoemission dynamics in argon in the 20–40 eV spectral range, in the vicinity of the 3s−1np autoionizing resonances. We present measurements of the differential photoionization cross section and extract energy and angle-dependent atomic time delays with an attosecond interferometric method. With the support of a theoretical model, we are able to attribute a large part of the measured time delay anisotropy to the presence of autoionizing resonances, which not only distort the phase of the emitted photoelectron wave packet but also introduce an angular dependence.

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“…Nowadays, models able to describe reactions assisted by a stronger NIR are available. Among them, the soft-photon approximation [7] was successfully applied to study angular distributions (ADs) in laser-assisted atomic photoionization by photons from free electron laser [8] or high harmonic generation (HHG) [6,9] sources. Also, it was established in previous studies for atomic/molecular targets [10][11][12] that the Separable Coulomb-Volkov model (SCV) may provide results in qualitative agreement with ab-initio calculations.…”

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confidence: 99%

“…The sophisticated techniques involved in the measurement of energy-and angle-resolved spectra have evolved in an outstanding way. The long-term stability of the ATPT-NIR synchronization, necessary for this kind of experiment in cold target recoil ion momentum spectroscopy devices, was reduced to about 60 attoseconds [9,13], enabling thus the determination of the AD of photoelectrons with a given energy and an almost fixed ATPT-NIR delay. Experimental studies concerned with the photoelectron ADs, although scarce, showed a critical dependence with the ATPT-NIR delay [9,[13][14][15][16][17].…”

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confidence: 99%

Atoms ionized by assisted attopulses behaving as diatomic molecules

Boll¹,

Fojón²

2015

Preprint

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The single ionization of noble gas atoms by the combined action of XUV attopulses and an infrared laser field is theoretically investigated by means of a non-perturbative model that under certain approximations gives closed-form expressions for the angular distributions of photoelectrons. Interestingly, our model allow us to interpret the angular distributions as two-center interferences where the separation between the centers is governed by the infrared laser field. Angular distributions are compared to the available experimental data showing a good agreement. Finally, we deduce the conditions to obtain zeros in the angular distributions coming from destructive two-center interferences.

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Attosecond evolution of energy- and angle-resolved photoemission spectra in two-color (XUV+IR) ionization of rare gases

Cited by 14 publications

References 21 publications

Spatio-spectral structures in high harmonic generation driven by tightly focused high repetition rate lasers

Spatio-spectral structures in high harmonic generation driven by tightly focused high repetition rate lasers

Anisotropic photoemission time delays close to a Fano resonance

Atoms ionized by assisted attopulses behaving as diatomic molecules

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