M. Scheer

CCDC 852530: Experimental Crystal Structure Determination

The Cambridge Structural Database, 2012

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

CCDC 822357: Experimental Crystal Structure Determination

The Cambridge Structural Database, 2013

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

CCDC 729842: Experimental Crystal Structure Determination

The Cambridge Structural Database, 2010

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

CCDC 729846: Experimental Crystal Structure Determination

The Cambridge Structural Database, 2010

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Comparison of multiplicity distributions to the negative binomial distribution in muon-proton scattering

Zeitschrift Für Physik C Particles And Fields, Sep 1, 1987

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Multiplicities of charged hadrons in 280 GeV/c muon-proton scattering

Nuclear Physics B, 1985

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Measurement of the ratios of deep inelastic muon-nucleus cross sections on various nuclei compared to deuterium

Physics Letters B, Mar 1, 1988

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Compensation of Beam Line Polarizing Effects at UE112 of BESSY II

Nucleation and Atmospheric Aerosols, 2010

Reflections in synchrotron radiation beam lines tend to change the state of polarization of the r... more Reflections in synchrotron radiation beam lines tend to change the state of polarization of the radiation. This effect is more pronounced for steep angle of incidence, i.e. at low photon energy (say below 100 eV) beam lines. The APPLE II undulator UE112 at BESSY has all four magnetic rows shiftable and thus generates any state of polarization. To provide any intended polarization state at the sample we perform polarization measurements based on simple and fast linear polarization analysis that together with calculations of the undulator radiation predicts undulator settings that cancel beam line polarization effects.

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Tolerance studies for the BESSY FEL undulators

Nuclear Instruments and Methods in Physics Research, Aug 1, 2004

... pulse structure and the spectrum. Acknowledgements. The authors would like to thankSven Reich... more

Simulations of diagnostic spectrometers for the European XFEL using the ray-trace tool RAY

Proceedings of SPIE, Sep 8, 2011

ABSTRACT This paper presents the outcome of ray tracing simulations for different optical schemes... more ABSTRACT This paper presents the outcome of ray tracing simulations for different optical schemes to be setup at the European X-ray Free Electron Laser facility (XFEL.EU), Germany: one- or two- channel (cut) crystal X-ray monochromators (K-Mono; using spontaneous radiation) are planned and designed mainly for photon beam based alignment, which is gap tuning of the undulator segments and phase tuning of the phase shifters during commissioning and maintenance of the undulators. The coherent SASE (Self Amplified Spontaneous Emission) radiation will be monitored pulse-resolved by single-shot spectrometers of which two types are investigated: i) a three element spectrometer, design proposed by Yabashi et al., which consists of a curved focusing mirror, followed by a flat analyzer crystal and a 2D-detector.ii) a two element spectrometer based on a reflection zone plate that reflects and focuses in one step, and a 2D-detector (currently under development).

TWO-BAND MAGNETO-OPTICAL ELEMENTS FOR SOFT X-RAY POLARIZATION ANALYSIS AT THE Fe, Co 2p AND Gd 3d EDGES

Surface Review and Letters, Apr 1, 2002

We present angle-, energy- and polarization-dependent magneto-optical properties of Gd/Fe and Gd/... more We present angle-, energy- and polarization-dependent magneto-optical properties of Gd/Fe and Gd/Co multilayers with periods of the order of 1 nm for the photon energy range of 700–1230 eV. In the vicinity of the 2p absorption edge of transition metals (TM) and the 3d edge of the rare earth elements (RE), the X ray magnetic circular dichroism (XMCD) was measured in transmission and the X ray resonant magnetic scattering (XRMS) was investigated in L-MOKE geometry. The magnetic state of Gd could be realized at room temperature. Based on these data a calibrated detector of the polarization state of synchrotron radiation has been developed.

First results of the circularly polarized undulator beamline at BESSY II

Nucleation and Atmospheric Aerosols, 2000

ABSTRACT A beamline for circularly polarized radiation from a Sasaki type elliptical double undul... more ABSTRACT A beamline for circularly polarized radiation from a Sasaki type elliptical double undulator has been recently commissioned at BESSY-II. The PGM (Plane Grating Monochromator) based beamline works with collimated light and employs only one set of optical elements for steering and monochromatising the two (circularly) polarized, angularly separated, beams. The first commissioning results are presented here to illustrate the capabilities of this undulator-beamline concerning photon flux, photon energy resolution and polarization characteristics. .

Effect of Undulators on Transverse Resonant Island Orbits

12th International Particle Accelerator Conference (IPAC'21), Campinas, SP, Brazil, 24-28 May 2021, Aug 1, 2021

For one week in October 2020, BESSY II offered a Two Orbit mode to users for the first time. In t... more For one week in October 2020, BESSY II offered a Two Orbit mode to users for the first time. In this Two Orbit mode, the existence of transverse resonant island buckets is exploited to store a second beam in the storage ring as an 'island orbit', away from the primary beam axis. This mode was offered with free range of motion of the 12 out of vacuum undulators installed in the BESSY II ring. Diagnostics of the island orbit were limited to a single camera, monitoring bending magnet radiation from a single dipole. A significant motion of the island orbit was observed on this diagnostic and correlated with undulator gap motion. This observation is reported, and simulations presented to demonstrate how this motion could arise. Correction schemes are suggested.

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Papers by M. Scheer