FS-FLASH-O

Latest additions:
2020-01-13
14:26
[PUBDB-2020-00139] Journal Article
et al
Time-Resolved Dissociation Dynamics of Iodomethane Resulting from Rydberg and Valence Excitation
Rydberg excitations in the vacuum ultraviolet spectral range may open upmolecular photoreaction pathways not accessible from lower-lying valence states. Here,single-shot UV/VUV pump−probe spectroscopy was used to study the photodissociationdynamics of iodomethane after 268 nm excitation in the A-band and excitation of the 6p(2E3/2) Rydberg state at 161 nm. [...]
Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:530
Detailed record - Similar records
2019-11-14
15:58
[PUBDB-2019-04226] Contribution to a conference proceedings
et al
Two-Color Operation of FLASH2 Undulator
39th International Free-Electron Laser Conference, FEL19, HamburgHamburg, Germany, 26 Aug 2019 - 30 Aug 20192019-08-262019-08-30 Geneva : JACoW, CERN TUP055 ()
FLASH is the first soft X-ray FEL user facility, routinely providing brilliant photon beams for users since 2005. The second undulator branch of this facility, FLASH2, is gap-tunable which allows to test and use advanced lasing concepts. [...]
External link: Download fulltextFulltext

Detailed record - Similar records
2019-10-16
12:35
OpenAccess [PUBDB-2019-03691] Journal Article
et al
Strong-Field Extreme-Ultraviolet Dressing of Atomic Double Excitation
We report on the experimental observation of a strong-field dressing of an autoionizing two-electronstate in helium with intense extreme-ultraviolet laser pulses from a free-electron laser. The asymmetricFano line shape of this transition is spectrally resolved, and we observe modifications of the resonanceasymmetry structure for increasing free-electron-laser pulse energy on the order of few tens of Microjoules.A quantum-mechanical calculation of the time-dependent dipole response of this autoionizing state, drivenby classical extreme-ultraviolet (XUV) electric fields, evidences strong-field-induced energy and phaseshifts of the doubly excited state, which are extracted from the Fano line-shape asymmetry. [...]
OpenAccess: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:530
Detailed record - Similar records
2019-09-23
11:19
OpenAccess [PUBDB-2019-03424] Journal Article
et al
Nonlinear Coherence Effects in Transient-Absorption Ion Spectroscopy with Stochastic Extreme-Ultraviolet Free-Electron Laser Pulses
We demonstrate time-resolved nonlinear extreme-ultraviolet absorption spectroscopy on multiply charged ions, here applied to the doubly charged neon ion, driven by a phase-locked sequence of two intense free-electron laser pulses. Absorption signatures of resonance lines due to $2p-3d$ bound–bound transitions between the spin-orbit multiplets $^3P_{0,1,2}$ and $^3D_{1,2,3}$ of the transiently produced doubly charged Ne$^{2+}$ ion are revealed, with time-dependent spectral changes over a time-delay range of (2.4±0.3) fs. [...]
OpenAccess: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:530
Detailed record - Similar records
2019-09-23
10:57
Embargoed OpenAccess [PUBDB-2019-03423] Journal Article
et al
Tracing charge transfer in argon dimers by XUV-pump IR-probe experiments at FLASH
Charge transfer (CT) at avoided crossings of excited ionized states of argon dimers is observed using a two-color pump-probe experiment at the free-electron laser in Hamburg (FLASH). The process is initiated by the absorption of three 27-eV-photons from the pump pulse, which leads to the population of Ar2+*–Ar states. [...]
Published on 2019-08-30. Available in OpenAccess from 2020-08-30.: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:530
Detailed record - Similar records
2019-09-19
19:02
OpenAccess [PUBDB-2019-03416] Journal Article/Contribution to a conference proceedings
et al
Intensity-dependent near-threshold ionization of Kr in the vacuum-uv
International Conference on Spectral Lines Shapes, DublinDublin, Ireland, 17 Jun 2018 - 22 Jun 20182018-06-172018-06-22 Journal of physics / Conference Series Conference Series 1289, 012030 - () [10.1088/1742-6596/1289/1/012030]  GO
In this work, we present measurements of the intensity-dependent photoelectron spectrum of Kr irradiated by the FLASH FEL tuned to a photon energy of 25.8 eV. Intensity dependent photoelectron spectra were obtained with the aid of a Velocity Map Imaging (VMI) spectrometer. [...]
OpenAccess: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:530
Detailed record - Similar records
2019-07-12
10:44
OpenAccess [PUBDB-2019-02698] Journal Article
et al
Evidence of Extreme Ultraviolet Superfluorescence in Xenon
We present a comprehensive experimental and theoretical study on superfluorescence in the extreme ultraviolet wavelength regime. Focusing a free-electron laser pulse in a cell filled with Xe gas, the medium is quasi-instantaneously population inverted by 4d-shell ionization on the giant resonance followed by Auger decay [...]
OpenAccess: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:530
Detailed record - Similar records
2019-07-09
16:47
OpenAccess [PUBDB-2019-02678] Journal Article
et al
Wavefront-propagation simulations supporting the design of a time-delay compensating monochromator beamline at FLASH2
Wavefront-propagation simulations have been performed to complete the design of a monochromator beamline for FLASH2, the variable-gap undulator line at the soft X-ray free-electron laser in Hamburg (FLASH). Prior to propagation through the beamline optical elements, the parameters of the photon source were generated using the GENESIS code which includes the free-electron laser experimental data. [...]
OpenAccess: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:550
Detailed record - Similar records
2019-06-21
10:30
OpenAccess [PUBDB-2019-02527] Journal Article
et al
Two-color XUV+NIR femtosecond photoionization of neon in the near-threshold region
Results of angle-resolved electron spectroscopy of near-threshold photoionization of Ne atoms bycombined femtosecond extreme ultraviolet and near infraredfields are presented. The dressed-electron spectra show an energetic distribution into so-called sidebands, being separated by thephoton energy of the dressing laser [...]
OpenAccess: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:530
Detailed record - Similar records
2019-05-29
11:54
OpenAccess [PUBDB-2019-02388] Journal Article
et al
An X-ray gas monitor for free-electron lasers
A novel X-ray gas monitor (XGM) has been developed which allows the measurement of absolute photon pulse energy and photon beam position at all existing and upcoming free-electron lasers (FELs) over a broad spectral range covering vacuum ultraviolet (VUV), extreme ultraviolet (EUV) and soft and hard X-rays. The XGM covers a wide dynamic range from spontaneous undulator radiation to FEL radiation and provides a temporal resolution of better than 200 ns [...]
OpenAccess: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:550
Detailed record - Similar records