Experiments at FLASH

Bostedt, Christoph; Chapman, Henry N.; Costello, J. T.; López‐Urrutia, J. R. Crespo; Düsterer, S.; Epp, Sascha W.; Feldhaus, J.; Föhlisch, Alexander; Meyer, Michael; Möller, Thomas; Moshammer, R.; Richter, M.; Sokolowski‐Tinten, K.; Sorokin, A. A.; Tiedtke, K.; Ullrich, J.; Würth, W.

doi:10.1016/j.nima.2008.12.202

Cited by 93 publications

(64 citation statements)

References 100 publications

(97 reference statements)

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“…This, however, would require using a much longer wavelength of radiation of about 12 nm (100 eV) to assure sufficiently strong scattering at large angles. This long wavelength regime is not available at LCLS, but is common at the FLASH and FERMI free electron lasers [37][38]. A recent XFEL based wide angle x-ray scattering study of Ag nano-particles enabled the reconstruction of their three-dimensional shapes [36].…”

Section: Oblate and Prolate Shapes Of Rotating Dropletsmentioning

confidence: 99%

Shapes of rotating superfluid helium nanodroplets

et al. 2017

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Rotating superfluid He droplets of approximately 1 μm in diameter were obtained in a free nozzle beam expansion of liquid He in vacuum and were studied by single-shot coherent diffractive imaging using an x-ray free electron laser. The formation of strongly deformed droplets is evidenced by large anisotropies and intensity anomalies (streaks) in the obtained diffraction images. The analysis of the images shows that, in addition to previously described axially symmetric oblate shapes, some droplets exhibit prolate shapes. Forward modeling of the diffraction images indicates that the shapes of rotating superfluid droplets are very similar to their classical counterparts, giving direct access to the droplet angular momenta and angular velocities. The analyses of the radial intensity distribution and appearance statistics of the anisotropic images confirm the existence of oblate metastable superfluid droplets with large angular momenta beyond the classical bifurcation threshold.3

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Section: Oblate and Prolate Shapes Of Rotating Dropletsmentioning

confidence: 99%

Shapes of rotating superfluid helium nanodroplets

et al. 2017

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“…The interested reader can find comprehensive information on the underlying theory, design and operation of short wavelength FELs in a number of reviews and overviews [6,7,8,9,10] while descriptions of the broader range of experiments possible in AMO physics, condensed matter, imaging etc. carried out at FLASH can be found in references [11,12].…”

Section: Operation In 2007 the Spring-8 Compact Sase Source (Scss) Tmentioning

confidence: 99%

“…As mention in introduction, the SCSS test accelerator in Japan [4,20] provides linearly polarized EUV-FEL radiation (~ 30 µJ per pulse, ~100 fs pulse width, [10][11][12][13][14][15][16][17][18][19][20] Hz repetition rate) in the wavelength region 51-62 nm at saturation. This energy regime is of particular interest because all atoms, except helium, in any forms of matter, can be ionized with huge photoionization cross sections.…”

Section: Ii11 Amo Science At Scss Test Accelerator In Japan (Sendaimentioning

confidence: 99%

“…As described earlier, Free Electron Lasers (FEL) like the FLASH at Hamburg [12], the SCSS test facility in Japan [4] or the LCLS at Stanford [5,57], deliver light pulses from the extreme ultra-violet (EUV) to X-ray energies with unprecedented intensity (10 15 W/cm 2 and more are routinely achieved) and ultra-short durations in the 100 fs regime even reaching less than 7 fs [57]. Among others, they enable for the first time Even though considerable progress has been achieved (see e.g.…”

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

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

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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“…The recent advent of free-electron-laser (FEL) light sources has made it possible to investigate intense photon-matter interaction at shorter wavelengths [9][10][11]. Because the ponderomotive energy is proportional to the inverse square of the laser frequency, ω −2 , the direct effect of the laser field on the electron movement is much smaller at short wavelengths than at NIR energies.…”

Section: Introductionmentioning

confidence: 99%

Charge and energy transfer in argon-core–neon-shell clusters irradiated by free-electron-laser pulses at 62 nm

Sugishima¹,

Iwayama²,

Yase³

et al. 2012

Phys. Rev. A

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Charge and energy transfer in argon-core-neon-shell clusters irradiated by free-electron-laser pulses at 62 nm.Physical Review A. Atomic, Molecular, and Optical Physics, 86(3) The multiple ionization of Ar-core-Ne-shell clusters in intense extreme-ultraviolet laser pulses (λ ∼ 62 nm) from the free-electron laser in Japan was investigated utilizing a momentum imaging technique. The Ar composition dependence of the kinetic energies and the yields of the fragment ions give evidence for charge transfer from the Ar core to the Ne shell. We have extended the uniformly charged sphere model originally applied to pristine clusters [Islam et al., Phys. Rev. A 73, 041201(R) (2006)] to the core-shell heterogeneous clusters to estimate the amounts of charge and energy transfers.

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Experiments at FLASH

Cited by 93 publications

References 100 publications

Shapes of rotating superfluid helium nanodroplets

Shapes of rotating superfluid helium nanodroplets

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

Charge and energy transfer in argon-core–neon-shell clusters irradiated by free-electron-laser pulses at 62 nm

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