H. Schmidt‐Böcking
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View article: Reflections and Tributes
Reflections and Tributes Open
It was in the year 1960 that our paths first crossed. Hans was looking for a diploma thesis with Professor Maier-Leibnitz, and I was fortunate to have him assigned to me, an assistant at the Institute of Technical Physics at the Technical …
View article: Renewable Electric Energy Storage Systems by Storage Spheres on the Seabed of Deep Lakes or Oceans
Renewable Electric Energy Storage Systems by Storage Spheres on the Seabed of Deep Lakes or Oceans Open
This paper describes a new underwater pumped storage hydropower concept (U.PSH) that can store electric energy by using the high water pressure on the seabed or in deep lakes to accomplish the energy transition from fossil to renewable sou…
View article: One hundred years ago Alfred Land\\'e unriddled the Anomalous Zeeman\n Effect and presaged Electron Spin
One hundred years ago Alfred Land\\'e unriddled the Anomalous Zeeman\n Effect and presaged Electron Spin Open
In order to commemorate Alfred Land\\'e's unriddling of the anomalous Zeeman\nEffect a century ago, we reconstruct his seminal contribution to atomic physics\nin light of the atomic models available at the time. Land\\'e recognized that\nt…
View article: A new route for enantio-sensitive structure determination by photoelectron scattering on molecules in the gas phase
A new route for enantio-sensitive structure determination by photoelectron scattering on molecules in the gas phase Open
Combination of Coulomb explosion imaging, molecular frame diffraction imaging, and ab initio computations provide a route for enantio-sensitive structure determination.
View article: One hundred years of Alfred Landé's <i>g</i> ‐factor
One hundred years of Alfred Landé's <i>g</i> ‐factor Open
Prompted by the centenary of Alfred Landé's g ‐factor, we reconstruct Landé's path to his discovery of half‐integer angular momentum quantum numbers and of vector coupling of atomic angular momenta—both encapsulated in the g ‐factor—as wel…
View article: Fourfold Differential Photoelectron Circular Dichroism
Fourfold Differential Photoelectron Circular Dichroism Open
We report on a joint experimental and theoretical study of photoelectron circular dichroism (PECD) in methyloxirane. By detecting O 1s photoelectrons in coincidence with fragment ions, we deduce the molecule's orientation and photoelectron…
View article: One Hundred Years of Alfred Landé’s g-Factor
One Hundred Years of Alfred Landé’s g-Factor Open
Prompted by the centenary of Alfred Landé’s g-factor, we reconstruct Landé’s path to his discovery of half-integer angular momentum quantum numbers and of vector coupling of atomic angular momenta - both encapsulated in the g-factor - as w…
View article: The COLTRIMS Reaction Microscope—The Spyhole into the Ultrafast Entangled Dynamics of Atomic and Molecular Systems
The COLTRIMS Reaction Microscope—The Spyhole into the Ultrafast Entangled Dynamics of Atomic and Molecular Systems Open
The COLTRIMS Reaction Microscope C‐REMI can image the momentum vectors of all emitted charged fragments in an atomic or molecular reactions similar to the bubble chamber in high energy particle physics. C‐REMI can detect fragments with “ze…
View article: Closed-loop recycling of rare liquid samples for gas-phase experiments
Closed-loop recycling of rare liquid samples for gas-phase experiments Open
Many samples of current interest in molecular physics and physical chemistry exist in the liquid phase and are vaporized for use in gas cells, diffuse gas targets, or molecular gas jets. For some of these techniques, the large sample consu…
View article: Ultra-fast Dynamics in Quantum Systems Revealed by Particle Motion as Clock
Ultra-fast Dynamics in Quantum Systems Revealed by Particle Motion as Clock Open
To explore ultra-fast dynamics in quantum systems one needs detection schemes which allow time measurements in the attosecond regime. During the recent decades, the pump & probe two-pulse laser technique has provided milestone results on u…
View article: The Precision Limits in a Single-Event Quantum Measurement of Electron Momentum and Position
The Precision Limits in a Single-Event Quantum Measurement of Electron Momentum and Position Open
A modern state-of-the-art “ quantum measurement ” [The term “quantum measurement” as used here implies that parameters of atomic particles are measured that emerge from a single scattering process of quantum particles.] of momentum and pos…
View article: Otto Stern’s Molecular Beam Method and Its Impact on Quantum Physics
Otto Stern’s Molecular Beam Method and Its Impact on Quantum Physics Open
Motivated by his interest in thermodynamics and the emerging quantum mechanics, Otto Stern (1888–1969) launched in 1919 his molecular beam method to examine the fundamental assumptions of theory that transpire in atomic, molecular, optical…
View article: Wilhelm Heinrich Heraeus—Doctoral Student at the University Frankfurt
Wilhelm Heinrich Heraeus—Doctoral Student at the University Frankfurt Open
Wilhelm Heinrich Heraeus (*1900 – †1985), the founder of the Wilhelm and Else Heraeus Foundation, wrote his doctoral thesis at the University of Frankfurt in 1922–23 under the supervision of Richard Wachsmuth and Walther Gerlach. Thereby, …
View article: Molecular Beams in Physics and Chemistry
Molecular Beams in Physics and Chemistry Open
Motivated by his interest in thermodynamics and the emerging quantum mechanics, Otto Stern (1888Stern ( -1969) ) launched in 1919 his molecular beam method to examine the fundamental assumptions of theory that transpire in atomic, molecula…
View article: An International Symposium (Wilhelm and Else Heraeus Seminar # 702) Marked the Centennial of Otto Stern's First Molecular Beam Experiment and the Thriving of Atomic Physics; A European Physical Society Historic Site Was Inaugurated
An International Symposium (Wilhelm and Else Heraeus Seminar # 702) Marked the Centennial of Otto Stern's First Molecular Beam Experiment and the Thriving of Atomic Physics; A European Physical Society Historic Site Was Inaugurated Open
OPINION article Front. Phys., 04 December 2019Sec. Physical Chemistry and Chemical Physics Volume 7 - 2019 | https://doi.org/10.3389/fphy.2019.00208
View article: The Stern-Gerlach experiment re-examined by an experimenter
The Stern-Gerlach experiment re-examined by an experimenter Open
The historic Stern-Gerlach experiment (SGE), which was performed in 1922 in Frankfurt, is reviewed from an experimental point of view. It is shown that the SGE apparatus is a purely classical momentum spectrometer, in which the trajectorie…
View article: Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers Open
This article shows how the COLTRIMS (Cold Target Recoil Ion Momentum Spectroscopy) or the "reaction microscope" technique can be used to distinguish between enantiomers (stereoisomers) of simple chiral species on the level of individual mo…
View article: Stereochemical configuration and selective excitation of the chiral molecule halothane
Stereochemical configuration and selective excitation of the chiral molecule halothane Open
The molecular configuration of the chiral ethane derivative halothane (CHBrClCF3) was investigated via Coulomb Explosion Imaging using a COLTRIMS (Cold Target Recoil Ion Momentum Spectroscopy) setup. Several four-particle fragmentation pat…
View article: Observation of Enhanced Chiral Asymmetries in the Inner-Shell Photoionization of Uniaxially Oriented Methyloxirane Enantiomers
Observation of Enhanced Chiral Asymmetries in the Inner-Shell Photoionization of Uniaxially Oriented Methyloxirane Enantiomers Open
Most large molecules are chiral in their structure: they exist as two enantiomers, which are mirror images of each other. Whereas the rovibronic sublevels of two enantiomers are almost identical (neglecting a minuscular effect of the weak …
View article: Two-Particle Interference of Electron Pairs on a Molecular Level
Two-Particle Interference of Electron Pairs on a Molecular Level Open
We investigate the photodouble ionization of H_{2} molecules with 400 eV photons. We find that the emitted electrons do not show any sign of two-center interference fringes in their angular emission distributions if considered separately. …
View article: Cover Picture: Absolute Configuration from Different Multifragmentation Pathways in Light‐Induced Coulomb Explosion Imaging (ChemPhysChem 16/2016)
Cover Picture: Absolute Configuration from Different Multifragmentation Pathways in Light‐Induced Coulomb Explosion Imaging (ChemPhysChem 16/2016) Open
The Front Cover picture illustrates that light-induced Coulomb explosions can image the absolute configuration of small molecules in the gas phase. Even partial fragmentation displays the signature of handedness. More information can be fo…
View article: Absolute Configuration from Different Multifragmentation Pathways in Light‐Induced Coulomb Explosion Imaging
Absolute Configuration from Different Multifragmentation Pathways in Light‐Induced Coulomb Explosion Imaging Open
The front cover artwork is provided by the groups of Reinhard Dörner (University of Frankfurt), Robert Berger (University of Marburg) and Jürgen Stohner (Zurich University for Applied Sciences, Wädenswil). The image shows how a single X‐ra…
View article: Agreement of Experiment and Theory on the Single Ionization of Helium by Fast Proton Impact
Agreement of Experiment and Theory on the Single Ionization of Helium by Fast Proton Impact Open
Even though the study of ion-atom collisions is a mature field of atomic physics, large discrepancies between experiment and theoretical calculations are still common. Here we present experimental results with high momentum resolution on t…
View article: Quasi-molecular electron promotion beyond the 1s$\sigma$ and 2p$\pi$ channels in slow collisions of He$^{2+}$ and He
Quasi-molecular electron promotion beyond the 1s$\sigma$ and 2p$\pi$ channels in slow collisions of He$^{2+}$ and He Open
The electron emission pattern of transfer-ionization in collisions of\nHe$^{2+}$ with He was investigated for impact velocities between 0.53 a.u. and\n0.77 a.u. (7 keV/u - 15 keV/u) employing recoil-ion momentum spectroscopy. This\nprocess…
View article: Single ionization of helium by fast proton impact: Searching for projectile coherence
Single ionization of helium by fast proton impact: Searching for projectile coherence Open
The fully differential cross section (FDCS) for single ionization p + He → p + e + He+ at proton energy of 1 MeV is studied both experimentally and theoretically. The 3D angular electron distribution is presented. The role of electron-elec…
View article: Direct Determination of Molecular Handedness via Coulomb Explosion Imaging
Direct Determination of Molecular Handedness via Coulomb Explosion Imaging Open
In this work, we show that the direct determination of a chiral molecule's absolute configuration can be achieved with Coulomb Explosion Imaging in a COLTRIMS reaction microscope. We compare the results after ionisation with femto-second l…
View article: Charge transfer processes in proton-helium collisions: The validity of the first Born approximation
Charge transfer processes in proton-helium collisions: The validity of the first Born approximation Open
The validity of the Born series expansion for the charge transfer reactions is studied in the case of a proton-helium collision. Three different channels are considered, namely the charge transfer, transfer excitation and transfer ionizati…