An access to buried interfaces: the X-ray reflectivity set-up of BL9 at DELTA

Paulus, Michael; Lietz, Daniela; Sternemann, Christian; Shokuie, Kaveh; Evers, Florian; Tolan, Metin; Czeslik, Claus; Winter, Roland

doi:10.1107/s0909049508026745

Cited by 28 publications

(36 citation statements)

References 36 publications

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“…These reflectivities were measured at BL 9 of DELTA, 21,22 with a photon energy of h = 15.2 keV. A program that combines a PARRATT algorithm with an effective density model was used for the data analysis.…”

Section: Methodsmentioning

confidence: 99%

Standing-wave excited photoemission experiments on Si/MoSi2 multilayer mirrors in the soft x-ray regime: An analytical modeling approach

Döring

Schönbohm

Weier

et al. 2009

Journal of Applied Physics

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Photoemission experiments were performed on Si/MoSi2 multilayers using soft x-ray standing waves for excitation. The combination of photoemission spectroscopy and standing-wave excitation results in a depth profile of the sample that is also sensitive to chemical states. The experimental data were analyzed using an approximate analytical, rather than a full numerical, method in order to more quickly yield results, as well as to calibrate and better understand the method. The important parameters in the resulting equations are discussed in detail. Thus, we quickly obtain access to the key parameters modulating the photoelectron intensity excited by x-ray standing waves. We demonstrate the analytical approach on a simple experimental test data set.

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Section: Methodsmentioning

confidence: 99%

Standing-wave excited photoemission experiments on Si/MoSi2 multilayer mirrors in the soft x-ray regime: An analytical modeling approach

Döring

Schönbohm

Weier

et al. 2009

Journal of Applied Physics

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“…Measurements were performed at beamline BL9 of the synchrotron light source DELTA (Dortmund, Germany) in a θ − 2 θ ‐geometry . A photon energy of 12.4keV (corresponding to a photon wavelength of λ = 1.00Å) was used.…”

Section: Characterizationmentioning

confidence: 99%

Self‐assembled silane monolayers: an efficient step‐by‐step recipe for high‐quality, low energy surfaces

Lessel

Bäumchen

Klos

et al. 2015

Surface & Interface Analysis

111

125

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Organosilane self-assembled monolayers (SAMs) are commonly used for modifying a wide range of substrates. Depending on the end group, highly hydrophobic or hydrophilic surfaces can be achieved. Silanization bases on the adsorption, self-assembly and covalent binding of silane molecules onto surfaces and results in a densely packed, SAM. Following wet chemical routines, the quality of the monolayer is often variable and, therefore, unsatisfactory. The process of self-assembly is not only affected by the chemicals involved and their purity but is also extremely sensitive to ambient parameters such as humidity or temperature and to contaminants. Here, a reliable and efficient wet-chemical recipe is presented for the preparation of ultra-smooth, highly ordered alkyl-terminated silane SAMs on Si wafers. The resulting surfaces are characterized by means of atomic force microscopy, X-ray reflectometry and contact angle measurements.

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“…X-ray Reflectivity (XRR) XRR experiments were performed at the beamline BL9 of the DELTA synchrotron radiation facility in Dortmund, Germany (19 ). For the measurements, a photon energy of 27 keV was chosen balancing between flux and transmission through water while reducing simultaneously the possible beam damage (15 ).…”

Section: Substrate Preparationmentioning

confidence: 99%

α-Synuclein Insertion into Supported Lipid Bilayers As Seen by in Situ X-ray Reflectivity

Hähl

Möller

Kiesel

et al. 2015

ACS Chem. Neurosci.

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Large aggregates of misfolded -synuclein inside neuronal cells are the hallmarks of Parkinson's disease. The protein's natural function and its supposed toxicity, however, are believed to be closely related to its interaction with cell and vesicle membranes. Upon this interaction, the protein folds into an -helical structure and intercalates into the membrane. In this study, we focus on the changes in the lipid bilayer caused by this intrusion. In situ X-ray reflectivity was applied to determine the vertical density structure of the bilayer before and after exposure to -synuclein. It was found that the -synuclein insertion, wild type and E57K variant, caused a reduction in bilayer thickness. This effect may be one factor in the membrane pore formation ability of -synuclein. AbstractLarge aggregates of misfolded α-synuclein inside neuronal cells are the hallmarks of Parkinson's disease. The protein's natural function and its supposed toxicity, however, are believed to be closely related to its interaction with cell and vesicle membranes. Upon this interaction, the protein folds into an α-helical structure and intercalates into the membrane. In this study, we focus on the changes in the lipid bilayer caused by this intrusion. In situ X-ray reflectivity was applied to determine the vertical density structure of the bilayer before and after exposure to α-synuclein. It was found that the α-synuclein insertion, wild type and E57K variant, caused a reduction in bilayer thickness. This effect may be one factor in the membrane pore formation ability of α-synuclein.

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An access to buried interfaces: the X-ray reflectivity set-up of BL9 at DELTA

Cited by 28 publications

References 36 publications

Standing-wave excited photoemission experiments on Si/MoSi2 multilayer mirrors in the soft x-ray regime: An analytical modeling approach

Standing-wave excited photoemission experiments on Si/MoSi2 multilayer mirrors in the soft x-ray regime: An analytical modeling approach

Self‐assembled silane monolayers: an efficient step‐by‐step recipe for high‐quality, low energy surfaces

α-Synuclein Insertion into Supported Lipid Bilayers As Seen by in Situ X-ray Reflectivity

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