Photoelectron spectroscopy of sequential three-photon double ionization of Ar irradiated by EUV free-electron laser pulses

Fukuzawa, H.; Грызлова, Е. В.; Motomura, K.; Yamada, Akifumi; Ueda, Kiyoshi; Grum-Grzhimailo, A N; Страхова, С. И.; Nagaya, K.; Sugishima, A.; Mizoguchi, Y.; Iwayama, H.; Yao, Makoto; Saitô, Norio; Piseri, P.; Mazza, Tommaso; Devetta, M.; Coreno, Marcello; Nagasono, Mitsuru; Tono, Kensuke; Yabashi, Makina; Ishikawa, Tetsuya; Ohashi, Haruhiko; Kimura, Hiroaki; Togashi, Tadashi; Senba, Yasunori

doi:10.1088/0953-4075/43/11/111001

Cited by 29 publications

(22 citation statements)

References 33 publications

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“…Recently, pioneering experimental reports on resonance multiphoton ionization of atoms by strong EUV FEL lights have appeared [12][13][14][15][16]. Among these studies Miyauchi et al [14] and Sato et al [16] have revealed that the ionization probability deviates strongly from the conventional I n scaling for nonresonance multiphoton ionization.…”

Section: Introductionmentioning

confidence: 99%

Suppression of ionization probability due to Rabi oscillations in the resonance two-photon ionization of He by EUV free-electron lasers

et al. 2011

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The two-photon resonance ionization probability of atoms in strong extreme-ultraviolet free-electron laser (EUV FEL) pulses has been investigated by the model of time-dependent wave packet propagation of a lightcoupled multilevel atom. Under the simulation within the model assuming single-mode FEL pulses, the ionization probability P ion has shown characteristic dependences on the scaled coupling parameter U gi between two levels of the ground (g) and intermediate (i) resonance states, namely, P ion ∝ (U gi ) n , with n being equal to ∼2, less than 1, and ∼1 for the small, medium, and large U gi regimes, respectively. This power dependence of the ionization probability has been interpreted due to Rabi oscillations between g and i states. To compare with recent experimental results on the same condition, the multimode nature of self-amplitude spontaneous emission (SASE) FEL pulses has been managed in the simulation. Then, the recent experimental laser-power dependence of the two-photon resonance ionization of He [Sato et al., J. Phys. B 44, 161001 (2011)] has been well described by that for the large U gi regime of the simulation, i.e., n ∼ 1. Thus, the observed linear laser-power dependence has been rationalized as being caused by the strong Rabi oscillations between the (2p)-(1s) states.

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Section: Introductionmentioning

confidence: 99%

Suppression of ionization probability due to Rabi oscillations in the resonance two-photon ionization of He by EUV free-electron lasers

et al. 2011

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“…The spectrum of the FEL pulse can overlap the position of one or several excited intermediate-ion states thus leading to resonant enhancement of the 3PDI [64][65][66].…”

Section: Pads In Sequential 3pdimentioning

confidence: 99%

“…For the resonantly enhanced sequential 3PDI, a simple three-step mechanism was first implied [64], when after the first-step ionization (1), the second photon excites one or several discrete states, depending on the spectral profile of the pulse, while the third photon ionizes the excited and generally polarized ion. Such an approach allowed to explain observed angle-resolved photoelectron spectra in Ar around 20 eV kinetic electron energy, produced by FEL facility SPring-8 Compact SASE Source test accelerator (Japan) with the photon energies of 24.18-24.70 eV [64].…”

Section: Pads In Sequential 3pdimentioning

confidence: 99%

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Photoelectron angular distributions and correlations in sequential double and triple atomic ionization by free electron lasers

Grum–Grzhimailo

Грызлова

Fritzsche

et al. 2015

Journal of Modern Optics

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We present a review of theoretical studies of the simplest nonlinear photoprocesses detected in the XUV range with the use of free electron lasers: sequential double and triple ionization of atoms by two and three XUV photons. Photoelectron angular distributions and angular correlations between emitted electrons are considered. A comparison of the calculated results with recent angle-resolved photoelectron spectroscopy experiments is discussed.

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“…The theoretical description is based on a recently developed stepwise ionization model, where each subsequent photon interacts with an ionic intermediate state formed at a preceding step. This approach, in combination with the statistical tensor formalism [19], was previously successfully applied to sequential 2PDI from the outer p shells of noble gas atoms [8,20,21] and three-photon resonantly enhanced sequential double ionization of argon [22]. Within this model, anisotropy in the photoelectron emission and alignment of the intermediate states are fully taken into account.…”

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Angle-resolved photoelectron spectroscopy of sequential three-photon triple ionization of neon at 90.5 eV photon energy

et al. 2011

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Multiple photoionization of neon atoms by a strong 13.7 nm (90.5 eV) laser pulse has been studied at the FLASH free electron laser in Hamburg. A velocity map imaging spectrometer was used to record angle-resolved photoelectron spectra on a single-shot basis. Analysis of the evolution of the spectra with the FEL pulse energy in combination with extensive theoretical calculations allows the ionization pathways that contribute to be assigned, revealing the occurrence of sequential three-photon triple ionization. The development of free electron lasers (FELs) emitting radiation in the extreme ultraviolet and the x-ray spectral range heralds a new era in the study of nonlinear processes at high photon frequency. Using these new sources (FLASH in Germany, SPring-8 in Japan, and LCLS in the USA), previously unexplored regimes of atomic and molecular strong field ionization become accessible. In the first experiments [1-3] strongly nonlinear multiple ionization of atoms has already been observed. Since mainly multiply charged ions were detected, it was impossible to unambiguously identify the ionization mechanisms. Accordingly, the interpretation of some of these experiments is still under debate [4,5], and the main question is whether the experimental results can be understood without introducing new concepts, e.g., collective effects, in the description of the multiphoton multiple ionization at high frequencies. In the simplest case of two-photon double ionization (2PDI) two basic mechanisms have been established: direct (nonsequential) ionization, where both photons are absorbed simultaneously, and sequential ionization, where, after absorption of a first photon and emission of the first electron, intermediate ionic states are formed that are further ionized by a second photon. In order to disentangle the ionization mechanisms, a number of experimental techniques have so far been used, which include measurements of ionic charge state distributions [6], energyand angle-resolved electron spectroscopy [7,8], measurements of recoil-ion-momentum distributions [9][10][11][12], and kinematically complete experiments using a reaction microscope [8]. Together with extensive accompanying theoretical work (e.g., Ref.[13] and references therein) these experiments have significantly advanced our understanding of 2PDI. In particular it was established, as first predicted theoretically [14], that sequential ionization is dominant if the photon energy is larger than the binding energy of the singly charged ion.As a logical next step in studies of multiphoton multiple ionization in the high-frequency regime, we report the first observation of sequential three-photon triple ionization (3PTI) of neon atoms, based on a measurement of angle-resolved photoelectron spectra using the velocity map imaging technique [15]. Strong field triple ionization is much more complicated than double ionization due to the larger number of processes that can contribute. Therefore, although triply charged ions have been reported [1,2,9], individual pathway...

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Photoelectron spectroscopy of sequential three-photon double ionization of Ar irradiated by EUV free-electron laser pulses

Cited by 29 publications

References 33 publications

Suppression of ionization probability due to Rabi oscillations in the resonance two-photon ionization of He by EUV free-electron lasers

Suppression of ionization probability due to Rabi oscillations in the resonance two-photon ionization of He by EUV free-electron lasers

Photoelectron angular distributions and correlations in sequential double and triple atomic ionization by free electron lasers

Angle-resolved photoelectron spectroscopy of sequential three-photon triple ionization of neon at 90.5 eV photon energy

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