Multicolour above-threshold ionization of helium: quantum interference effects in angular distributions

Guyétand, O.; Gisselbrecht, Mathieu; Huetz, A.; Agostini, Pierre; Taïeb, Richard; Véniard, Valérie; Maquet, Alfred; Antonucci, L.; Boyko, Olga; Valentin, C.; Douillet, D.

doi:10.1088/0953-4075/38/22/l01

Cited by 44 publications

(44 citation statements)

References 22 publications

(20 reference statements)

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“…Hishikawa et al [40] recently investigated two-and three-photon ionization of He at the SCSS test accelerator by photoelectron spectroscopy using a magnetic bottle spectrometer. Though not single-color, the PAD from multi-color above-threshold ionization of He has recently been reported [41,42].…”

Section: Introductionmentioning

confidence: 99%

Photoelectron Angular Distribution and Phase in Two-Photon Single Ionization of H and He by a Femtosecond and Attosecond Extreme-Ultraviolet Pulse

Ishikawa

Ueda

2013

Applied Sciences

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We theoretically study the photoelectron angular distribution (PAD) from the two-photon single ionization of H and He by femtosecond and attosecond extreme-ultraviolet pulses, based on the time-dependent perturbation theory and simulations with the full time-dependent Schrödinger equation. The PAD is formed by the interference of the s and d continuum wave packets, and, thus, contains the information on the relative phase δ and amplitude ratio between them. We find that, when a spectrally broadened femtosecond pulse is resonant with an excited level, the PAD substantially changes with pulse width, since the competition between resonant and nonresonant ionization paths, leading to δ distinct from the scattering phase shift difference, changes with it. In contrast, when the Rydberg manifold is excited, and for the case of above-threshold two-photon ionization, δ and the PAD do not depend much on pulse width, except for the attosecond region. Thus, the Rydberg manifold and the continuum behave similarly in this respect. For a high-harmonic pulse composed of multiple harmonic orders, while the value of δ is different from that for a single-component pulse, the PAD still rapidly varies with pulse width. The present results illustrate a new way to tailor the continuum wave packet.

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Section: Introductionmentioning

confidence: 99%

Photoelectron Angular Distribution and Phase in Two-Photon Single Ionization of H and He by a Femtosecond and Attosecond Extreme-Ultraviolet Pulse

Ishikawa

Ueda

2013

Applied Sciences

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“…In the previous section, we saw how the partial photoionization probabilities (25), (29) and (31) describe the yield of photoelectrons for a given sideband, as a function of the two emission angles ϑ p and ϕ p for different kinds of targets. Of course, these probabilities also depend on the spin-and orbital angular momenta of the incident XUV and assisting NIR laser fields.…”

Section: E Dichroism In Two-color Fieldsmentioning

confidence: 99%

“…Apart from the temporal structure of the XUV and NIR pulses, the intensity of the sidebands depends of course also on the relative orientation and linear polarization of these fields [24,25]. This orientation dependence has been explored especially by Meyer and coworkers [20] for the angular distribution of the sidebands in the photoionization of helium.…”

Section: Introductionmentioning

confidence: 99%

Probing the energy flow in Bessel light beams using atomic photoionization

2016

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The two-color above-threshold ionization (ATI) of atoms and ions is investigated for a vortex Bessel beam in the presence of a strong near-infrared (NIR) light field. While the photoionization is caused by the photons from the weak but extreme ultra-violet (XUV) vortex Bessel beam, the energy and angular distribution of the photoelectrons and their sideband structure are affected by the planewave NIR field. We here explore the energy spectra and angular emission of the photoelectrons in such two-color fields as a function of the size and location of the target atoms with regard to the beam axis. In addition, analogue to the circular dichroism in typical two-color ATI experiments with circularly polarized light, we define and discuss seven different dichroism signals for such vortex Bessel beams that arise from the various combinations of the orbital and spin angular momenta of the two light fields. For localized targets, it is found that these dichroism signals strongly depend on the size and position of the atoms relative to the beam. For macroscopically extended targets, in contrast, three of these dichroism signals tend to zero, while the other four just coincide with the standard circular dichroism, similar as for Bessel beams with small opening angle. Detailed computations of the dichroism are performed and discussed for the 4s valence-shell photoionization of Ca + ions.

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“…Many studies, both experimental and theoretical, of the sideband patterns in XUV + IR ionization have been performed (for example [18][19][20][21][22][23] sidebands [23][24][25][26][27][28][29][30][31][32][33][34]. Recently such experiments with circularly polarized XUV beams from FELs became feasible [35,36].…”

Section: Introductionmentioning

confidence: 99%

Above-threshold ionization in neon produced by combining optical and bichromatic XUV femtosecond laser pulses

2017

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We consider the ionization of neon induced by a femtosecond laser pulse composed of overlapping, linearly polarized bichromatic extreme ultraviolet and infrared fields. In particular, we study the effects of the infrared light on a two-pathway ionization scheme for which Ne 2s 2 2p 5 3s 1 P is used as intermediate state. Using time-dependent calculations, supported by a theoretical approach based on the strong-field approximation, we analyze the ionization probability and the photoelectron angular distributions associated with the different sidebands of the ionization spectrum. Complex oscillations of the angular distribution anisotropy parameters as a function of the infrared light intensity are revealed. Finally, we demonstrate that coherent control of the asymmetry is achievable by tuning the infrared frequency to a nearby electronic transition.

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Multicolour above-threshold ionization of helium: quantum interference effects in angular distributions

Cited by 44 publications

References 22 publications

Photoelectron Angular Distribution and Phase in Two-Photon Single Ionization of H and He by a Femtosecond and Attosecond Extreme-Ultraviolet Pulse

Photoelectron Angular Distribution and Phase in Two-Photon Single Ionization of H and He by a Femtosecond and Attosecond Extreme-Ultraviolet Pulse

Probing the energy flow in Bessel light beams using atomic photoionization

Above-threshold ionization in neon produced by combining optical and bichromatic XUV femtosecond laser pulses

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