38 citations · 283 across the 23 of their papers we have counts for
23 papers
X-ray Absorption and Resonant X-ray Emission at the Carbon Edge of LiCO
John Vinson, Terrence Jach, Rainer Unterumsberger +2
While highly successful, density functional theory is known to have limitations owing to its neglect of many-body electron-electron interactions. This neglect leads to errors in th…
The Behavior of the Intercalant AlCl_4 Anion during the Formation of Graphite Intercalation Compound: An X-ray Absorption Fine Structure Study
Giorgia Greco, Giuseppe Antonio Elia, Yves Kayser +4
This work aims to study the insertion of AlCl_4^- anion in the crystalline structure of oriented pyrolytic graphite (PG) at the point of view of the anion itself. The electronic an…
A review and outlook on anionic and cationic redox in Ni-, Li- and Mn-rich layered oxides LiMeO2 (Me = Li, Ni, Co, Mn)
Bixian Ying, Zhenjie Teng, Sarah Day +13
The present work reviews the charge compensation in Ni based layered oxides (LiNi1-xMexO2 with x <= 0.2, Me = Co, Mn, space group R-3m) relating performance parameters to changes i…
Titanium and titanium oxides at the K- and L-edges: validating theoretical calculations of X-ray absorption and X-ray emission spectra with measurements
Karina Bzheumikhova, John Vinson, Rainer Unterumsberger +5
Using well-calibrated experimental data we validate theoretical X-ray absorption spectroscopy (XAS) as well as X-ray emission spectroscopy (XES) calculations for titanium (Ti), tit…
Experimental determination of ruthenium L-shell fluorescence yields and Coster-Kronig transition probabilities
Nils Wauschkuhn, Katja Frenzel, Burkhard Beckhoff +1
The L-shell fluorescence yields and the Coster-Kronig factors of ruthenium (and the corresponding uncertainty) were determined for the first time experimentally by applying radiome…
Meta Reinforcement Learning for Optimal Design of Legged Robots
Álvaro Belmonte-Baeza, Joonho Lee, Giorgio Valsecchi +1
The process of robot design is a complex task and the majority of design decisions are still based on human intuition or tedious manual tuning. A more informed way of facing this t…
Experimental determination of the gadolinium L subshells fluorescence yields and Coster-Kronig transition probabilities
Yves Kayser, Philipp Hönicke, Malte Wansleben +2
The L subshell Coster Kronig (CK) transition factors of Gd have been experimentally determined by means of two different experimental approaches and compared to available literatur…
In situ gas cell for the analysis of adsorption behavior on surfaces using x-ray spectroscopy
Cornelia Streeck, Daniel Grötzsch, Jan Weser +5
A gas cell for in-situ measurements of Volatile Organic Compounds (VOCs) and their adsorption behavior on different surfaces by means of X-Ray Fluorescence (XRF) and X-ray Absorpti…
Experimental and theoretical approaches for determining the K-shell fluorescence yield of carbon
Philipp Hönicke, Rainer Unterumsberger, Mauro Guerra +8
The knowledge of atomic fundamental parameters, such as the fluorescence yields with low uncertainties, is of decisive importance in elemental quantification involving X-ray fluore…
Grazing incidence X-ray fluorescence based characterization of nanostructures for element sensitive profile reconstruction
Anna Andrle, Philipp Hönicke, Philipp Schneider +6
For the reliable fabrication of the current and next generation of nanostructures it is essential to be able to determine their material composition and dimensional parameters. Usi…
Peculiarities in quantification of airborne particulate matter by means of Total Reflection X-ray Fluorescence
Yves Kayser, János Osán, Philipp Hönicke +1
Knowledge on the temporal and size distribution of particulate matter (PM) in air as well as on its elemental composition is a key information for source appointment, for the inves…
Speciation of FeS and FeS by means of X-ray Emission Spectroscopy using a compact full-cylinder von Hamos spectrometer
Malte Wansleben, John Vinson, André Wählisch +4
We present Fe K X-ray emission (XES) and Fe K X-ray absorption spectra (XAS) of Iron(II)sulfide (FeS) and Iron(II)disulfide (FeS). While XES and XAS offer different discrimi…
Grazing incidence-X-ray fluorescence for a dimensional and elemental characterization of well-ordered nanostructures
Philipp Hönicke, Anna Andrle, Yves Kayser +6
The increasing importance of well-controlled ordered nanostructures on surfaces represents a challenge for existing metrology techniques. To develop such nanostructures and monitor…
Interaction of nanoparticle properties and X-ray analytical techniques
Rainer Unterumsberger, Philipp Hönicke, Yves Kayse +5
In this work, Pt-Ti core-shell nanoparticles (NP) of 2 nm to 3 nm in size and 30000 u \pm 1500 u as specified single particle mass, deposited on flat silicon substrates by means of…
Validation of secondary fluorescence excitation in quantitative X-ray fluorescence analysis of thin alloy films
André Wählisch, Cornelia Streeck, Philipp Hönicke +1
X-ray fluorescence (XRF) analysis is a widely applied technique for the quantitative analysis of thin films up to the m scale because of its non-destructive nature and because i…
Towards a calibration of laboratory setups for grazing incidence and total-reflection X-ray fluorescence analysis
Philipp Hönicke, Ulrich Waldschläger, Thomas Wiesner +2
Grazing-Incidence X-ray fluorescence (GIXRF) analysis, which is closely related to total-reflection XRF, is a very powerful technique for the in-depth analysis of many types of tec…
Resonant X-ray Emission and Valence-band Lifetime Broadening in LiNO
John Vinson, Terrence Jach, Matthias Müller +2
X-ray absorption and resonant inelastic x-ray scattering measurements are carried out on lithium nitrate LiNO. The orbitals around the nitrogen atoms exhibit a large lifeti…
Experimental determination of line energies, line widths and relative transition probabilities of the Gadolinium L X-ray emission spectrum
Malte Wansleben, Yves Kayser, Philipp Hönicke +4
In this work the complete L-emission spectrum of gadolinium with respect to line energies, natural line widths, and relative transition probabilities was investigated using monochr…
Photon flux determination of a liquid-metal jet x-ray source by means of photon scattering
Malte Wansleben, Claudia Zech, Cornelia Streeck +4
Liquid-metal jet X-ray sources promise to deliver high photon fluxes, which are unprecedented for laboratory based X-ray sources, because the regenerating liquid-metal anode is les…
Reference-free GIXRF-XRR as a methodology for independent validation of XRR on ultrathin layer stacks and a depth-dependent characterization
Philipp Hönicke, Blanka Detlefs, Yves Kayser +3
Nanolayer stacks are technologically very relevant for current and future applications in many fields of research. A non-destructive characterization of such systems is often perfo…
Accurate experimental determination of Gallium K- and L3-shell XRF fundamental parameters
Rainer Unterumsberger, Philipp Hönicke, Julien L. Colaux +4
The fluorescence yield of the K- and L3-shell of gallium was determined using the radiometrically calibrated (reference-free) X-ray fluorescence instrumentation at the BESSY II syn…
Characterization of sub-monolayer coatings as novel calibration samples for X-ray spectroscopy
Philipp Hönicke, Markus Krämer, Lars Lühl +7
With the advent of both modern X-ray fluorescence (XRF) methods and improved analytical reliability requirements the demand for suitable reference samples has increased. Especially…
Element sensitive reconstruction of nanostructured surfaces with finite elements and grazing incidence soft X-ray fluorescence
Victor Soltwisch, Philipp Hönicke, Yves Kayser +4
The geometry of a SiN lamellar grating was investigated experimentally with reference-free grazing-incidence X-ray fluorescence analysis. While simple layered systems are u…