Circular Dichroism in Multiphoton Ionization of Resonantly Excited<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>He</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Ions

Ilchen, Markus; Douguet, Nicolas; Mazza, Tommaso; Rafipoor, A. J.; Callegari, Carlo; Finetti, P.; Plekan, Oksana; Prince, Kevin C.; Demidovich, Alexander; Grazioli, Cesare; Avaldi, L.; Bolognesi, P.; Coreno, Marcello; Fraia, Michele Di; Devetta, M.; Ovcharenko, Yevheniy; Düsterer, S.; Ueda, Kiyoshi; Bartschat, Klaus; Grum–Grzhimailo, A. N.; Bozhevolnov, A. V.; Kazansky, A. K.; Кабачник, Н. М.; Meyer, Michael

doi:10.1103/physrevlett.118.013002

Cited by 69 publications

(55 citation statements)

References 42 publications

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“…In particular, polarization control of intense high-energy FEL pulses [24,25] enables one today to test the chiral or dichroic properties of matter with unprecedented accuracy [26,27] and in extreme ultraviolet or xray energy domains. For example, Ilchen et al [28] have recently studied circular dichroism of oriented He + ions and found the atomic orientation imprinted on both, the differential and total cross sections. On the other, circular dichroism can also be used as a tool for analyzing the polarization state of FELs [29].…”

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confidence: 99%

Maximum Elliptical Dichroism in Atomic Two-Photon Ionization

2018

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Elliptical dichroism is known in atomic photoionization as the difference in the photoelectron angular distributions produced in nonlinear ionization of atoms by left- and right-handed elliptically polarized light. We theoretically demonstrate that the maximum dichroism |Δ_{ED}|=1 always appears in two-photon ionization of any atom if the photon energy is tuned in so that the electron emission is dominantly determined by two intermediate resonances. We propose the two-photon ionization of atomic helium in order to demonstrate this remarkable phenomenon. The maximum elliptical dichroism could be used as a sensitive tool for analyzing the polarization state of photon beams produced by free-electron lasers.

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confidence: 99%

Maximum Elliptical Dichroism in Atomic Two-Photon Ionization

2018

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“…Past studies have investigated the dependence of the ionization rate on the relative helicity of a onecolor circularly polarized field and the atomic orbital from which the electron is ionized, showing that at low(high) intensities, a co(counter)-rotating geometry is preferred [42][43][44][45][46]. Additionally, recent work has looked at helicity dependent ionization with a few vacuum ultraviolet and near-infrared (NIR) photons [47][48][49][50][51], in which the probability of ionization via different resonant pathways in He + was determined, and a helicity dependent ac Stark shift was observed [51].…”

Section: Introductionmentioning

confidence: 99%

Observation of ionization enhancement in two-color circularly polarized laser fields

et al. 2017

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When atoms are irradiated by two-color circularly polarized laser fields the resulting strong field processes are dramatically different than when the same atoms are irradiated by a single-color ultrafast laser. For example, electrons can be driven in complex 2D trajectories before rescattering or circularly polarized high harmonics can be generated, which was once thought impossible. Here, we show that two-color circularly polarized lasers also enable control over the ionization process itself and make a surprising finding: the ionization rate can be enhanced by up to 700% simply by switching the relative helicity of the two-color circularly polarized laser field. This enhancement is experimentally observed in helium, argon and krypton over a wide range of intensity ratios of the twocolor field. We use a combination of advanced quantum and fully classical calculations to explain this ionization enhancement as resulting in part due to the increased density of excited states available for resonance-enhanced ionization in counter-rotating fields compared with co-rotating fields. In the future, this effect could be used to probe the excited state manifold of complex molecules.

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“…As e.g. shown in [1,6] the NIR field increases the ionization potential by the dynamical Stark effect, leading to a reduction of the kinetic energy of the photoelectrons by U I 4…”

Section: Simulating Experimental Conditionsmentioning

confidence: 86%

“…Combining extreme ultraviolet (XUV) free-electron laser (FEL) radiation with intense optical or near infrared (NIR) laser fields opens up a wide range of laser assisted photoionization experiments [1][2][3][4][5][6][7]. Electrons emitted by XUV photoionization during an intense multi-cycle NIR field experience the quantum nature of the dressing field and can be shifted in energy by an integer number of NIR quanta, ±ÿω L , and hence change angular momentum.…”

Section: Introductionmentioning

confidence: 99%

Two-color XUV+NIR femtosecond photoionization of neon in the near-threshold region

et al. 2019

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Results of angle-resolved electron spectroscopy of near-threshold photoionization of Ne atoms by combined femtosecond extreme ultraviolet and near infrared fields are presented. The dressedelectron spectra show an energetic distribution into so-called sidebands, being separated by the photon energy of the dressing laser. Surprisingly, for the low kinetic energy (few eV) sidebands, the photoelectron energy varies as a function of the emission angle. Such behavior has not yet been observed in sideband creation and has not been predicted in commonly used theoretical descriptions such as strong field approximation and soft photon approach. Describing the photoionization with a time-dependent Schrödinger equation allows a qualitative description of the observed effect, as well as the prediction of fine structure in the sideband distribution.

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Circular Dichroism in Multiphoton Ionization of Resonantly ExcitedHe+Ions

Cited by 69 publications

References 42 publications

Maximum Elliptical Dichroism in Atomic Two-Photon Ionization

Maximum Elliptical Dichroism in Atomic Two-Photon Ionization

Observation of ionization enhancement in two-color circularly polarized laser fields

Two-color XUV+NIR femtosecond photoionization of neon in the near-threshold region

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