FS-FLASH-D

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2019-07-09
16:35
OpenAccess [PUBDB-2019-02676] Journal Article
et al
Electronic decay of core-excited HCl molecules probed by THz streaking
Structural dynamics 6(3), 034301 () [10.1063/1.5091756]  GO
The ultrafast electronic decay of HCl molecules in the time domain after resonant core excitation was measured. Here, a Cl-2p core electron was promoted to the antibonding σ* orbital initiating molecular dissociation, and simultaneously, the electronic excitation relaxes via an Auger decay [...]
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ddc:500
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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 [...]
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ddc:530
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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 [...]
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ddc:550
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2019-01-08
10:09
OpenAccess [PUBDB-2019-00091] Journal Article
et al
SwissFEL Aramis beamline photon diagnostics
The SwissFEL Aramis beamline, covering the photon energies between 1.77 keV and 12.7 keV, features a suite of online photon diagnostics tools to help both users and FEL operators in analysing data and optimizing experimental and beamline performance. Scientists will be able to obtain information about the flux, spectrum, position, pulse length, and arrival time jitter versus the experimental laser for every photon pulse, with further information about beam shape and size available through the use of destructive screens [...]
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ddc:550
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2019-01-07
15:26
OpenAccess [PUBDB-2019-00062] Journal Article
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Femtosecond profiling of shaped x-ray pulses
Arbitrary manipulation of the temporal and spectral properties of x-ray pulses at free-electron lasers would revolutionize many experimental applications. At the Linac Coherent Light Source at Stanford National Accelerator Laboratory, the momentum phase-space of the free-electron laser driving electron bunch can be tuned to emit a pair of x-ray pulses with independently variable photon energy and femtosecond delay [...]
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ddc:530
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2018-11-27
15:49
OpenAccess [PUBDB-2018-04884] Journal Article
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Separating Dipole and Quadrupole Contributions to Single-Photon Double Ionization
We report on a kinematically complete measurement of double ionization of helium by a single 1100 eV circularly polarized photon. By exploiting dipole selection rules in the two-electron continuum state, we observed the angular emission pattern of electrons originating from a pure quadrupole transition [...]
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2018-11-13
16:52
[PUBDB-2018-04481] Journal Article
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Damage accumulation in thin ruthenium films induced by repetitive exposure to femtosecond XUV pulses below the single-shot ablation threshold
The process of damage accumulation in thin ruthenium films exposed to multiple femtosecond extreme ultraviolet (XUV) free-electron laser (FEL) pulses below the critical angle of reflectance at the FEL facility in Hamburg (FLASH) was experimentally analyzed. The multi-shot damage threshold is found to be lower than the single-shot damage threshold. [...]
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ddc:620
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2018-11-07
16:12
OpenAccess [PUBDB-2018-04297] Conference Presentation
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Towards Chirp Control of XUV Free Electron Lasers
8th EPS-QEOD EUROPHOTON CONFERENCE, BarcelonaBarcelona, Spain, 2 Sep 2018 - 7 Sep 20182018-09-022018-09-07  GO
We use 267nm femtosecond laser pulses to modulate electrons of a XUV free electron laser. By changing the chirp of this laser pulses we can influence the chirp of the generated XUV FEL pulses, which are characterized by THz streaking. [...]
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2018-11-01
15:53
Embargoed OpenAccess [PUBDB-2018-04105] Journal Article
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Time-resolved electron spectroscopy for chemical analysis of photodissociation: Photoelectron spectra of Fe(CO)$_5$ , Fe(CO)$_4$ , and Fe(CO)$_3$
The prototypical photoinduced dissociation of Fe(CO)$_5$ in the gas phase is used to test time-resolved x-ray photoelectron spectroscopy for studying photochemical reactions. Upon one-photon excitation at 266 nm, Fe(CO)$_5$ successively dissociates to Fe(CO)$_4$ and Fe(CO)$_3$ along a pathway where both fragments retain the singlet multiplicity of Fe(CO)$_5$. [...]
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ddc:530
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2018-10-14
14:42
OpenAccess [PUBDB-2018-03783] Journal Article
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Photoionization of metastable heliumlike $C^{4+}$($1s\,2s\; ^3S_ 1)$ ions: Precision study of intermediate doubly excited states
In a joint experimental and theoretical endeavor, photoionization of metastable $C^{4+}$($1s\,2s\; ^3S_ 1)$ ions via intermediate levels with hollow, double-K-vacancy configurations $2s2p, 2s3p, 2p3s, 2p3d, 2s4p, 2p4s$, and $2p4d$ has been investigated. High-resolution photon-ion merged-beams measurements were carried out with the resolving power reaching up to 25 800 which is sufficient to separate the leading fine-structure components of the $2s2p^{3}P$ term. [...]
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ddc:530
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