Few-Photon Multiple Ionization of Ne and Ar by Strong Free-Electron-Laser Pulses

Moshammer, R.; Jiang, Yuhai; Foucar, L.; Rudenko, Artem; Ergler, Th.; Schröter, C. D.; Lüdemann, Susanna K.; Zrost, K.; Fischer, Daniel; Titze, J.; Jahnke, T.; Schöffler, M. S.; Weber, Thorsten; Dørner, R.; Zouros, T. J. M.; Dorn, Alexander; Ferger, T.; Kühnel, K. U.; Düsterer, S.; Treusch, R.; Radcliffe, P.; Plönjes, Elke; Ullrich, J.

doi:10.1103/physrevlett.98.203001

Cited by 150 publications

(117 citation statements)

References 20 publications

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“…Figure 10 [46]. Now, the momentum distribution exhibits a dipolarshaped momentum distribution reflecting the emission of the 22 eV photo-electron in the first step whereas the subsequently emitted low-energy electron from Ne + leads to a broadening of the ring-like momentum pattern only.…”

Section: Ii22 Few-photon -Few-electron Interactions In Atoms and Momentioning

confidence: 99%

“…The ion, electron, and reaction microscope spectra of molecular nitrogen [45], argon [46], neon [46,47], and helium [47,48] can generally be well interpreted in terms of target depletion, space-charge effects, and sequential and direct two-, three-, and four-photon processes as well. In contrast to xenon [39], here the non-linear dependence of the photoionization rate of an m(>1)-photon process…”

Section: Ii21 Non-linear Photoionization In the Soft X-ray Regime (mentioning

confidence: 99%

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Non-linear processes in the interaction of atoms and molecules with intense EUV and X-ray fields from SASE free electron lasers (FELs)

Berrah

Bozek

Costello

et al. 2010

Journal of Modern Optics

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109

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The advent of free electron laser (FEL) facilities capable of delivering high intensity pulses in the extreme-UV to X-ray spectral range has opened up a wide vista of opportunities to study and control light matter interactions in hitherto unexplored parameter regimes. In particular current short wavelength FELs can uniquely drive nonlinear processes mediated by inner shell electrons and in fields where the photon energy can be as high as 10 keV and so the corresponding optical period reaches below one attosecond. Combined with ultrafast optical lasers, or simply employing wavefront division, pump probe experiments can be performed with femtosecond time resolution. As single photon ionization of atoms and molecules is by now very well understood, they provide the ideal targets for early experiments by which not only can FELs be characterised and benchmarked but also the natural departure point in the hunt for nonlinear behaviour of atomistic systems bathed in laser fields of ultrahigh photon energy. In this topical review we illustrate with specific examples the gamut of apposite experiments in atomic, molecular physics currently underway at the SCSS test accelerator (Japan), FLASH (Hamburg) and LCLS (Stanford).

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Section: Ii22 Few-photon -Few-electron Interactions In Atoms and Momentioning

confidence: 99%

Section: Ii21 Non-linear Photoionization In the Soft X-ray Regime (mentioning

confidence: 99%

Non-linear processes in the interaction of atoms and molecules with intense EUV and X-ray fields from SASE free electron lasers (FELs)

Berrah

Bozek

Costello

et al. 2010

Journal of Modern Optics

Self Cite

109

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“…These facilities offer possibilities to explore inner-shell electron dynamics and nonlinear response of atoms and molecules to intense x-ray radiation (see, for example, Refs. [5][6][7][8][9][10]). …”

Section: Introductionmentioning

confidence: 99%

Enhanced nonlinear response of Ne8+to intense ultrafast x rays

et al. 2012

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We investigate the possible reasons for the discrepancy between the theoretical two-photon ionization cross section, ∼10 −56 cm 4 s, of Ne 8+ obtained within the perturbative nonrelativistic framework for monochromatic light [S. Novikov and A. Hopersky, J. Phys. B 34, 4857 (2001)] and the experimental value, 7 × 10 −54 cm 4 s, reported in [G. Doumy et al., Phys. Rev. Lett. 106, 083002 (2011)] at a photon energy of 1110 eV. To this end, we consider Ne 8+ exposed to deterministic and chaotic ensembles of intense x-ray pulses. The time-dependent configuration interaction singles (TDCIS) method is used to quantitatively describe nonlinear ionization of Ne 8+ induced by coherent intense ultrashort x-ray laser pulses. The impact of the bandwidth of a chaotic ensemble of x-ray pulses on the effective two-photon ionization cross section is studied within the lowest nonvanishing order of perturbation theory. We find that, at a bandwidth of 11 eV, the effective two-photon ionization cross section of Ne 8+ at a photon energy of 1110 eV amounts to 5 × 10 −57 and 1.6 × 10 −55 cm 4 s for a deterministic ensemble and a chaotic ensemble, respectively. We show that the enhancement obtained for a chaotic ensemble of pulses originates from the presence of the one-photon 1s 2 -1s4p resonance located at 1127 eV. Using the TDCIS approach, we also show that, for currently available radiation intensities, two-photon ionization of a 1s electron in neutral neon remains less probable than one-photon ionization of a valence electron.

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“…With this technique the charged fragments of atomic or molecular targets can be detected in coincidence essentially with a 4π solid angle obtaining their momentum vectors and, thus, providing the full kinematical information of scattering events. In the last 20 years, reaction microscopes have been used extensively to study the dynamics of atomic and molecular fragmentation processes in different experimental situations involving charged particle impact 3,4 , synchrotron radiation 5 , intense femto-6 and attosecond 7 light pulses, as well as free electron lasers 8 . This experimental technique requires gaseous targets at very low temperatures, as otherwise the thermal momentum spread at room temperature would make the recoil ion momentum measurement essentially insensitive to the scattering dynamics.…”

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confidence: 99%

Electron and recoil ion momentum imaging with a magneto-optically trapped target

Hubele

Schuricke

Goullon

et al. 2015

Review of Scientific Instruments

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A reaction microscope (ReMi) has been combined with a magneto-optical trap (MOT) for the kinematically complete investigation of atomic break-up processes. With the novel MOTReMi apparatus, the momentum vectors of the fragments of laser-cooled and state-prepared lithium atoms are measured in coincidence and over the full solid angle. The first successful implementation of a MOTReMi could be realized due to an optimized design of the present setup, a nonstandard operation of the MOT, and by employing a switching cycle with alternating measuring and trapping periods. The very low target temperature in the MOT (∼ 2 mK) allow for an excellent momentum resolution. Optical preparation of the target atoms in the excited Li 2 2 P 3/2 state was demonstrated providing an atomic polarization of close to 100 %. While first experimental results were reported earlier, in this work we focus on the technical description of the setup and its performance in commissioning experiments involving target ionization in 266 nm laser pulses and in collisions with projectile ions.

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Few-Photon Multiple Ionization of Ne and Ar by Strong Free-Electron-Laser Pulses

Cited by 150 publications

References 20 publications

Non-linear processes in the interaction of atoms and molecules with intense EUV and X-ray fields from SASE free electron lasers (FELs)

Non-linear processes in the interaction of atoms and molecules with intense EUV and X-ray fields from SASE free electron lasers (FELs)

Enhanced nonlinear response of Ne8+to intense ultrafast x rays

Electron and recoil ion momentum imaging with a magneto-optically trapped target

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