R. E. Grisenti

GSI Helmholtz Centre for Heavy Ion Research

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N. Petridis

GSI Helmholtz Centre for Heavy Ion Research

Th. Stöhlker

Friedrich Schiller University Jena

R. Dörner

Goethe University Frankfurt

U. Spillmann

GSI Helmholtz Centre for Heavy Ion Research

S. Hagmann

GSI Helmholtz Centre for Heavy Ion Research

T. Jahnke

European X-Ray Free-Electron Laser

M. S. Schöffler

Goethe University Frankfurt

Yu. A. Litvinov

GSI Helmholtz Centre for Heavy Ion Research

C. Kozhuharov

GSI Helmholtz Centre for Heavy Ion Research

Anton Kalinin

GSI Helmholtz Centre for Heavy Ion Research

Cooperative Institutions

GSI Helmholtz Centre for Heavy Ion Research

318

Goethe University Frankfurt

162

Centre National de la Recherche Scientifique

133

University of Giessen

106

Joint Institute for Nuclear Research

European Organization for Nuclear Research

Helmholtz Institute Jena

Max Planck Institute for Nuclear Physics

Technical University of Darmstadt

Istituto Nazionale di Fisica Nucleare

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Determination of Atom-Surface van der Waals Potentials from Transmission-Grating Diffraction Intensities

Physical Review Letters (1999)

R. E. Grisenti Wieland Schöllkopf J. P. Toennies Gerhard C. Hegerfeldt Thomas Köhler

Molecular beams of rare gas atoms and ${\mathrm{D}}_{2}$ have been diffracted from 100-nm-period ${\mathrm{SiN}}_{x}$ transmission gratings. The relative intensities of the diffraction peaks out to the eighth order depend on the diffracting particle and are interpreted in terms of effective slit widths. These differences have been analyzed by a new theory which accounts for the long-range van der Waals ${\ensuremath{-}C}_{3}/{l}^{3}$ interaction of the particles with the walls of the grating bars. The values of the ${C}_{3}$ constant for two different gratings are in good agreement and the results exhibit the expected linear dependence on the dipole polarizability.

10.1103/physrevlett.83.1755

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Citations (184)

New test of modulated electron capture decay of hydrogen-like 142Pm ions: Precision measurement of purely exponential decay

Physics Letters B (2019)

Fatma Öztürk B. Akkuş D. Atanasov Heinrich Beyer F. Bosch

An experiment addressing electron capture (EC) decay of hydrogen-like $^{142}$Pm$^{60+}$ ions has been conducted at the experimental storage ring (ESR) at GSI. The decay appears to be purely exponential and no modulations were observed. Decay times for about 9000 individual EC decays have been measured by applying the single-ion decay spectroscopy method. Both visually and automatically analysed data can be described by a single exponential decay with decay constants of 0.0126(7) s$^{-1}$ for automatic analysis and 0.0141(7) s$^{-1}$ for manual analysis. If a modulation superimposed on the exponential decay curve is assumed, the best fit gives a modulation amplitude of merely 0.019(15), which is compatible with zero and by 4.9 standard deviations smaller than in the original observation which had an amplitude of 0.23(4).

Exponential decay

Electron capture

Proton decay

10.1016/j.physletb.2019.134800

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Citations (18)

Refractive Index of Supercooled Water Down to 230.3 K in the Wavelength Range between 534 and 675 nm

The Journal of Physical Chemistry Letters (2022)

Claudia Goy Frédéric Caupin Michele Caresana Llorenç Cremonesi Anton Kalinin

Knowledge of the refractive index of water in the deeply supercooled metastable liquid state is important, for example, for an accurate description of optical reflection and refraction processes occurring in clouds. However, a measurement of both the temperature and wavelength dependence of the refractive index under such extreme conditions is challenging. Here, we employ Raman spectroscopy in combination with microscopic water jets in vacuum to obtain the refractive index of supercooled water to a lowest temperature of 230.3 K. While our approach is based on the analysis of Mie resonances in Raman spectra measured by using a single excitation wavelength at 532 nm, it allows us to obtain the refractive index in a wide visible wavelength range from 534 to 675 nm. Because of a direct link between the refractive index and density of water, our results provide a promising approach to help improve our understanding of water's anomalous behavior.

Supercooling

Metastability

10.1021/acs.jpclett.2c02803

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Citations (4)

Proton capture on stored radioactive ¹¹⁸Te ions

EPJ Web of Conferences (2023)

S. Dellmann J. Glorius Yu. A. Litvinov R. Reifarth Kafa Al-Khasawneh

Experimental determination of the cross sections of proton capture on radioactive nuclei is extremely difficult. Therefore, it is of substantial interest for the understanding of the production of the p-nuclei. For the first time, a direct measurement of proton-capture cross sections on stored, radioactive ions became possible in an energy range of interest for nuclear astrophysics. The experiment was performed at the Experimental Storage Ring (ESR) at GSI by making use of a sensitive method to measure (p, γ ) and (p,n) reactions in inverse kinematics. These reaction channels are of high relevance for the nucleosyn-thesis processes in supernovae, which are among the most violent explosions in the universe and are not yet well understood. The cross section of the 118 Te(p, γ ) reaction has been measured at energies of 6 MeV/u and 7 MeV/u. The heavy ions interacted with a hydrogen gas jet target. The radiative recombination process of the fully stripped 118 Te ions and electrons from the hydrogen target was used as a luminosity monitor. An overview of the experimental method and preliminary results from the ongoing analysis will be presented.

Electron capture

Nuclear astrophysics

Radioactive decay

10.1051/epjconf/202327911018

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Citations (2)

Three-electrode electrostatic deflection plates for low-energy charged beams

Review of Scientific Instruments (1983)

R. E. Grisenti A. Zecca

A simple system of electrostatic deflection plates with three electrodes is described.

Electrostatics

Deflection angle

10.1063/1.1137402

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Citations (0)

Time-Resolved Study of Crystallization in Deeply Cooled Liquid Parahydrogen

Physical Review Letters (2011)

M. Bissinger J. M. Fernández G. Tejeda Anton Kalinin S. Montero

We present real-time measurements of the crystallization process occurring in liquid para-hydrogen (para-H(2)) quenched to ≈0.65T(m) (T(m)=13.8 K is the melting point of bulk liquid para-H(2)). The combination of high spatial resolution Raman spectroscopy and liquid microjet generation allows, in situ, capturing structural changes with ∼10(-8) s time resolution. Our results provide a crystal growth rate that rules out a thermally activated freezing process and reveal that the quenched melt freezes into a metastable polymorph, which undergoes a structural transition. The achieved temporal control offers new opportunities for exploring the elementary processes of nonequilibrium phase transformations in supercooled liquids.

Supercooling

Metastability

10.1103/physrevlett.106.245301

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Citations (44)

Interference in the Collective Electron Momentum in Double Photoionization ofH2

Physical Review Letters (2008)

K. Kreidi D. Akoury T. Jahnke Th. Weber A. Staudte

We investigate single-photon double ionization of ${\mathrm{H}}_{2}$ by 130 to 240 eV circularly polarized photons. We find a double slitlike interference pattern in the sum momentum of both electrons in the molecular frame which survives integration over all other degrees of freedom. The difference momentum and the individual electron momentum distributions do not show such a robust interference pattern. We show that this interference results from a non-Heitler-London fraction of the ${\mathrm{H}}_{2}$ ground state where both electrons are at the same atomic center.

Momentum (technical analysis)

10.1103/physrevlett.100.133005

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Citations (65)

Nuclear physics experiments with ion storage rings

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2013)

Yu. A. Litvinov S. Bishop K. Blaum F. Bosch C. Brandau

Nuclear astrophysics

10.1016/j.nimb.2013.07.025

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Citations (70)

Imaging the structure of the trimer systems 4He3 and 3He4He2