H. Bromberger
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View article: A versatile and transportable endstation for controlled molecule experiments
A versatile and transportable endstation for controlled molecule experiments Open
We report on a new versatile transportable endstation for controlled molecule (eCOMO) experiments providing a combination of molecular beam purification by electrostatic deflection and simultaneous ion and electron detection using velocity…
View article: Timepix3: single-pixel multi-hit energy-measurement behaviour
Timepix3: single-pixel multi-hit energy-measurement behaviour Open
The event-driven hybrid-pixel detector readout chip, Timepix3, has the ability to simultaneously measure the time of an event on the nanosecond timescale and the energy deposited in the sensor. However, the behaviour of the system when two…
View article: TEMPUS, a Timepix4-based system for the event-based detection of X-rays
TEMPUS, a Timepix4-based system for the event-based detection of X-rays Open
TEMPUS is a new detector system being developed for photon science. It is based on the Timepix4 chip and, thus, it can be operated in two distinct modes: a photon-counting mode, which allows for conventional full-frame readout at rates up …
View article: Controlled molecule injector for cold, dense, and pure molecular beams at the European x-ray free-electron laser
Controlled molecule injector for cold, dense, and pure molecular beams at the European x-ray free-electron laser Open
A permanently available molecular-beam injection setup for controlled molecules (COMO) was installed and commissioned at the small quantum systems (SQS) instrument at the European x-ray free-electron laser (EuXFEL). A $b$-type electrostati…
View article: TEMPUS, a Timepix4-based system for event-based X-rays detection
TEMPUS, a Timepix4-based system for event-based X-rays detection Open
A readout system based on the Timepix4 ASIC, is being developed for photon science. The TEMPUS detector can be operated in two distinct modes: a photon counting mode, which allows for conventional full-frame readout at rates up to 40 kfps;…
View article: Timepix3: single-pixel multi-hit energy-measurement behavior
Timepix3: single-pixel multi-hit energy-measurement behavior Open
The event-driven hybrid-pixel detector readout chip, Timepix3, has the ability to simultaneously measure the time of an event on the nanosecond timescale and the energy deposited in the sensor. However, the behaviour of the system when two…
View article: A simulator for Timepix-like pixel front-ends
A simulator for Timepix-like pixel front-ends Open
This work presents the development of a front-end simulation code for the Timepix3 readout chip [1], intended as digitizer stage in full detector simulation. The front-end electronics is modelled using an integrator stage and 3 parallel fe…
View article: Reaction Pathways of Water Dimer Following Single Ionization
Reaction Pathways of Water Dimer Following Single Ionization Open
Water dimer (H2O)2─a vital component of the earth's atmosphere─is an important prototypical hydrogen-bonded system. It provides direct insights into fundamental chemical and biochemical processes, e.g., proton transfer and ionic supramolec…
View article: A versatile and transportable endstation for controlled molecule experiments
A versatile and transportable endstation for controlled molecule experiments Open
We report on a new versatile transportable endstation for controlled molecule (eCOMO) experiments providing a combination of molecular beam purification by electrostatic deflection and simultaneous ion and electron detection using velocity…
View article: Reaction Pathways of Water Dimer Following Single Ionization
Reaction Pathways of Water Dimer Following Single Ionization Open
Water dimer $(\text{H}_2\text{O})_2$ -- a vital component of the earth's atmosphere -- is an important prototypical hydrogen-bonded system. It provides direct insight into fundamental chemical and biochemical processes, e.g., proton transf…
View article: Time-Resolved X-ray Photoelectron Spectroscopy: Ultrafast Dynamics in CS<sub>2</sub>Probed at the S 2p Edge
Time-Resolved X-ray Photoelectron Spectroscopy: Ultrafast Dynamics in CS<sub>2</sub>Probed at the S 2p Edge Open
Recent developments in X-ray free-electron lasers have enabled a novel site-selective probe of coupled nuclear and electronic dynamics in photoexcited molecules, time-resolved X-ray photoelectron spectroscopy (TRXPS). We present results fr…
View article: Shot-by-shot 250 kHz 3D ion and MHz photoelectron imaging using Timepix3
Shot-by-shot 250 kHz 3D ion and MHz photoelectron imaging using Timepix3 Open
We demonstrate the application of event-driven Timepix3-based detectors in combination with a double-sided velocity-map-imaging spectrometer to record the full 3D momentum of charged particles at the free-electron-laser facility FLASH. We …
View article: Single-shot MHz velocity-map-imaging using two Timepix3 cameras
Single-shot MHz velocity-map-imaging using two Timepix3 cameras Open
We demonstrate the application of event-driven Timepix3-based detectors in combination with a double-sided velocity-map-imaging spectrometer to record the full 3D momentum of charged particles at the free-electron-laser facility FLASH. We …
View article: Generation of narrowband, high-intensity, carrier-envelope phase-stable pulses tunable between 4 and 18 THz
Generation of narrowband, high-intensity, carrier-envelope phase-stable pulses tunable between 4 and 18 THz Open
We demonstrate the generation of narrowband (<1 THz) high-energy (~2 uJ) carrier-envelope phase-stable pulses, tunable between 4 and 18 THz as achieved by difference-frequency mixing between chirped near-infrared pulses in organic DSTMS.
View article: Femtosecond profiling of shaped x-ray pulses
Femtosecond profiling of shaped x-ray pulses Open
Arbitrary manipulation of the temporal and spectral properties of X-ray\npulses at free-electron lasers (FELs) would revolutionize many experimental\napplications. At the Linac Coherent Light Source at Stanford National\nAccelerator Labora…
View article: Ultrafast momentum imaging of pseudospin-flip excitations in graphene
Ultrafast momentum imaging of pseudospin-flip excitations in graphene Open
The pseudospin of Dirac electrons in graphene manifests itself in a peculiar momentum anisotropy for photoexcited electron-hole pairs. These interband excitations are in fact forbidden along the direction of the light polarization and are …
View article: Enhanced electron-phonon coupling in graphene with periodically distorted lattice
Enhanced electron-phonon coupling in graphene with periodically distorted lattice Open
Electron-phonon coupling directly determines the stability of cooperative\norder in solids, including superconductivity, charge and spin density waves.\nTherefore, the ability to enhance or reduce electron-phonon coupling by optical\ndrivi…
View article: Angle-resolved photoemission spectroscopy with 9-eV photon-energy pulses generated in a gas-filled hollow-core photonic crystal fiber
Angle-resolved photoemission spectroscopy with 9-eV photon-energy pulses generated in a gas-filled hollow-core photonic crystal fiber Open
A recently developed source of ultraviolet radiation, based on optical soliton propagation in a gas-filled hollow-core photonic crystal fiber, is applied here to angle-resolved photoemission spectroscopy (ARPES). Near-infrared femtosecond …
View article: Phonon-Pump Extreme-Ultraviolet-Photoemission Probe in Graphene: Anomalous Heating of Dirac Carriers by Lattice Deformation
Phonon-Pump Extreme-Ultraviolet-Photoemission Probe in Graphene: Anomalous Heating of Dirac Carriers by Lattice Deformation Open
We modulate the atomic structure of bilayer graphene by driving its lattice at resonance with the in-plane E_{1u} lattice vibration at 6.3 μm. Using time- and angle-resolved photoemission spectroscopy (tr-ARPES) with extreme-ultraviolet (X…
View article: Femtosecond all-optical synchronization of an X-ray free-electron laser
Femtosecond all-optical synchronization of an X-ray free-electron laser Open
Many advanced applications of X-ray free-electron lasers require pulse durations and time resolutions of only a few femtoseconds. To generate these pulses and to apply them in time-resolved experiments, synchronization techniques that can …