OpenAccess

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2025-05-12
10:38
OpenAccess [PUBDB-2025-01596] Journal Article
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Black holes as fermion factories
[DESY-23-109; arXiv:2308.00741]
Ultralight bosons near rotating black holes can undergo significant growth through superradiant energy extraction, potentially reaching field values close to the Planck scale and transforming black holes into effective transducers for these fields. The interaction between boson fields and fermions may lead to parametric production or Schwinger pair production of fermions, with efficiencies significantly exceeding those of perturbative decay processes. [...]
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2025-05-09
14:21
OpenAccess [PUBDB-2025-01590] Book/Dissertation / PhD Thesis
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Statistical optics methods for generating, simulating, and characterising emission from relativistic electron beams
[DESY-THESIS-2025-008]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 172 pp. () [10.3204/PUBDB-2025-01590] = Dissertation, Universität Hamburg, 2025  GO
Synchrotron radiation sources and free-electron lasers have revolutionised the study of matter and biological systems by providing unique combinations of radiation pulse characteristics. Although these two types of facilities differ fundamentally in terms of pulses time scales, coherence properties, and (peak) brilliance, each offers an exceptional mix of these features. [...]
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2025-05-09
12:05
OpenAccess [PUBDB-2025-01584] Journal Article
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Interplay of protection and damage through intermolecular processes in the decay of electronic core holes in microsolvated organic molecules
Soft X-ray irradiation of molecules causes electronic core-level vacancies through photoelectron emission. In light elements, such as C, N, or O, which are abundant in the biosphere, these vacancies predominantly decay by Auger emission, leading inevitably to dissociative multiply charged states [...]
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2025-05-09
12:00
OpenAccess [PUBDB-2025-01583] Dissertation / PhD Thesis
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Intermolekulare Energie- und Ladungstransferprozesse in photoinduzierten anorganischen Ionen und biorelevanten Molekülen in wässriger Umgebung
KOBRA Universität Kassel 142 pp. () [10.17170/KOBRA-2025020610893] = Dissertation, University of Kassel, 2024  GO
Die Untersuchung der Wechselwirkung von Röntgenstrahlen mit biorelevanter Materie ist ein anhaltendes und weitverbreitetes Forschungsfeld. Obwohl die makroskopischen Folgen dieser Wechselwirkung bereits weitgehend verstanden sind, ist unser Verständnis der Prozesse auf molekularer Ebene noch sehr unzureichend. [...]
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2025-05-09
10:51
OpenAccess [PUBDB-2025-01581] Talk (non-conference)

openCost „Cost Data Survey“ - Results
The aim of the project openCost is to create a technical infrastructure that makes publication costs freely accessible and exchangeable via standardized interfaces and formats. This is supposed to enable cost transparency on an institutional, national, and international level.To achieve this, we are developing a standardized metadata schema to record, retrieve and map all publication costs of a scientific institution in a structured form. [...]
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2025-05-07
10:18
OpenAccess [PUBDB-2025-01545] Journal Article
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MHz X-ray photon correlation spectroscopy using an acoustic levitator at the European XFEL
The structural and dynamical properties of soft-matter systems play an important role in crystallization and nucleation theory. Despite their significance, the dynamical properties are still poorly understood because of experimental constraints and the requirement of performing measurements with high spatial and temporal resolution. [...]
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2025-05-06
13:46
OpenAccess [PUBDB-2025-01538] Journal Article
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Identification of metal-centered excited states in Cr( iii ) complexes with time-resolved L-edge X-ray spectroscopy
Chemical science 16(15), 6307 - 6316 () [10.1039/D4SC07625G]  GO
New coordination complexes of 3d metals that possess photoactive metal-centered (MC) excited states arepromising targets for optical applications and photocatalysis. Ultrafast spectroscopy plays an important rolein elucidating the photophysical mechanisms that underlie photochemical activity. [...]
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2025-05-05
16:39
OpenAccess [PUBDB-2025-01535] Journal Article
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Retained austenite in multipass high-strength weld metal with a yield strength exceeding 1100 MPa
Retained austenite is an essential phase in various types of steel due to its ability to positively influence mechanicalproperties. However, in the research field of high-strength weld metals, it is typically considered only aspart of martensite-austenite constituents. [...]
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2025-05-05
12:07
OpenAccess [PUBDB-2025-01527] Journal Article
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Charge conduction and relaxation in Ca$_{1−x}$Dy$_x$BaFe$_4$O$_7$
The paper presents in-depth studies of the dielectric properties and conduction dynamics of Dy-doped CaBaFe$_4$⁢O$_7$ which is a recently characterized magnetoelectric material with strong potentials for technological applications as it shows a near-room-temperature ferrimagnetic transition along with strong ferrimagnetic moment, and gigantic electric polarization change. This work demonstrates the direct correlation of the dielectric and electrical transport properties of Ca$_{1−𝑥}$⁢Dy$_𝑥$⁢BaFe$_4$⁢O$_7$ (𝑥=0, 0.01, 0.03, and 0.05) with structural distortion through various dc, ac conduction, high-energy x-ray diffraction studies, and modeling of the data [...]

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2025-05-05
11:20
OpenAccess [PUBDB-2025-01524] Book/Internal Report

Veröffentlichungen am DESY 2024
Publikationen für Zentrenfortschrittsbericht 81 p. () [10.3204/PUBDB-2024-01601]  GO
ISI oder SCOPUS Publikationen mit DESY Autor sowie alle Dissertationen mit DESY Beteiligung
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