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Your search keyword '"Marcel Mudrich"' showing total 5 results
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5 results on '"Marcel Mudrich"'

1. Inelastic scattering of photoelectrons from He nanodroplets

Author

Thomas Pfeifer, Marcel Mudrich, Aaron LaForge, M. Shcherbinin, Sivarama Krishnan, Muhammad Hanif, F. Vad Westergaard, and Robert Richter

Subjects
Physics, 010304 chemical physics, FOS: Physical sciences, General Physics and Astronomy, Electron, Photoionization, Inelastic scattering, Photoelectric effect, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, Ion, Extreme ultraviolet, Ionization, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Physics - Atomic and Molecular Clusters, Physics::Atomic Physics, Physical and Theoretical Chemistry, Atomic physics, Atomic and Molecular Clusters (physics.atm-clus), Electron ionization
Abstract

We present a detailed study of inelastic energy-loss collisions of photoelectrons emitted from He nanodroplets by tunable extreme ultraviolet (XUV) radiation. Using coincidence imaging detection of electrons and ions, we probe the lowest He droplet excited states up to the electron impact ionization threshold. We find significant signal contributions from photoelectrons emitted from free He atoms accompanying the He nanodroplet beam. Furthermore, signal contributions from photoionization and electron impact excitation/ionization occurring in pairs of nearest-neighbor atoms in the He droplets are detected. This work highlights the importance of inelastic electron scattering in the interaction of nanoparticles with XUV radiation.

Published
2019

2. Penning collisions between supersonically expanded metastable He atoms and laser-cooled Li atoms

Author

Frank Stienkemeier, Takamasa Momose, Jonas Grzesiak, Katrin Dulitz, and Marcel Mudrich

Subjects
Materials science, Atomic Physics (physics.atom-ph), FOS: Physical sciences, General Physics and Astronomy, chemistry.chemical_element, 010402 general chemistry, 01 natural sciences, Physics - Atomic Physics, Ion, Penning ionization, Physics - Chemical Physics, Ionization, Laser cooling, Metastability, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, Physical and Theoretical Chemistry, Nuclear Experiment, Helium, Chemical Physics (physics.chem-ph), Condensed Matter::Quantum Gases, 010304 chemical physics, 0104 chemical sciences, chemistry, Atomic number, Atomic physics, Excitation
Abstract

We describe an experimental setup comprised of a discharge source for supersonic beams of metastable helium atoms and a magneto-optical trap (MOT) for ultracold lithium atoms that makes it possible to study Penning ionization and associative ionization processes at high ion count rates. The cationic reaction products are analyzed using a novel ion detection scheme which allows for mass selection, a high ion extraction efficiency and a good collision-energy resolution. The influence of elastic He-Li collisions on the steady-state Li atom number in the MOT is described, and the collision data are used to estimate the excitation efficiency of the discharge source. We also show that Penning collisions can be directly used to probe the temperature of the Li cloud without the need for an additional time-resolved absorption or fluorescence detection system., accepted by J. Chem. Phys. (Dec. 2018)

Published
2019

3. A simple photoionization scheme for characterizing electron and ion spectrometers

Author

J. von Vangerow, Andreas Wituschek, Marcel Mudrich, Jonas Grzesiak, and Frank Stienkemeier

Subjects
Physics - Instrumentation and Detectors, Materials science, Spectrometer, FOS: Physical sciences, Physics::Optics, Instrumentation and Detectors (physics.ins-det), 02 engineering and technology, Electron, Photoionization, 021001 nanoscience & nanotechnology, Laser, 7. Clean energy, 01 natural sciences, law.invention, Characterization (materials science), Ion, law, 0103 physical sciences, Physics::Atomic Physics, Laser power scaling, Atomic physics, 010306 general physics, 0210 nano-technology, Instrumentation, Diode
Abstract

We present a simple diode laser-based photoionization scheme for generating electrons and ions with well-defined spatial and energetic (

Published
2016

4. Low-cost mechanical shutter for light beams

Author

Marcel Mudrich, Allard Mosk, Matthias Weidemüller, Kilian Singer, and Selim Jochim

Subjects
Attenuator (electronics), Optics, Materials science, business.industry, Shutter, Personal computer, Light beam, Loudspeaker, Polarization (waves), business, Instrumentation, Optical switch, Jitter
Abstract

We present a simple design of a fast mechanical shutter for light beams using a low-cost personal computer loudspeaker. The shutter is capable of closing an aperture of 5 mm at a maximum speed of 1.7 mm/ms with a timing jitter of less than 10 μs. When combined with polarization optics, our device can also be used as an alterable switch and adjustable attenuator.

Published
2002

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