Performance of the first undulator beamline U49-1-SGM at BESSY II

Senf, F.; Eggenstein, F.; Flechsig, U.; Follath, R.; Hartlaub, S.; Lammert, Heiner; Noll, T.; Schmidt, Jan-Simon; Reichardt, G.; Schwarzkopf, O.; Weiß, Markus; Zeschke, Thomas; Gudat, W.

doi:10.1016/s0168-9002(01)00372-2

Cited by 45 publications

(14 citation statements)

References 3 publications

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“…As a measure of the x-ray absorption, the total electron yield (TEY), in our experiment the total sample current, is recorded. The experiments have been carried out at beamline UE52-SGM [17] with a constant degree of 90% circular polarization at the BESSY II storage ring. The Fe and FePt alloy cluster samples have been prepared in situ in UHV at the synchrotron.…”

Section: Methodsmentioning

confidence: 99%

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Hybridization and magnetism in small FePt alloy clusters

et al. 2012

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Magnetic properties of small, mass selected, Fe and FePt alloy clusters deposited on a remanently magnetized Ni/Cu(001) substrate have been investigated using x-ray magnetic circular dichroism. Strong size-and stoichiometry-dependent magnetic properties of Fe and FePt clusters are found, together with enhanced orbital moments compared to bulk and nanoparticles. Compared to pure Fe clusters, FePt alloy clusters have lower orbital and higher spin moments. In addition, they show a higher branching ratio of B r = L 3 /(L 2 + L 3 ) due to stronger spin-orbital coupling and hybridization. Contents

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Section: Methodsmentioning

confidence: 99%

“…A counting time of 3 s per data point has been used for each photon helicity. The beamline resolution for the Fe 2p-3d spectra is 200 meV [17], and so was the step width we set for the spectra. To avoid an influence of contaminations due to residual gas adsorption the total measurement time for each cluster preparation was kept below 120 min.…”

Section: Methodsmentioning

confidence: 99%

Hybridization and magnetism in small FePt alloy clusters

et al. 2012

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“…The experiments were carried out on the UE52-SGM beamline of the synchrotron radiation source BESSY II (Berlin, Germany) [28,29]. The beamline was set to deliver vertically linearly polarized radiation.…”

Section: Methodsmentioning

confidence: 99%

Probing dissociative molecular dications by mapping vibrational wave functions

et al. 2011

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We present high-resolution photoelectron-Auger-electron coincidence spectra of methane (CH 4 ). Since the vibrational structure in the photoelectron spectrum is resolved, the Auger spectra corresponding to different vibrational levels can be separated. The seven final states of CH 2+ 4 are either dissociative or metastable, but in any case are populated in a repulsive part of their potential-energy curve via the Auger decay. The Auger line shapes can therefore be obtained by mapping the vibrational wave functions of the core-hole state into energy space. We have implemented this connection in the data analysis. By simultaneously fitting the different Auger spectra, detailed information on the energies of the dicationic states and their repulsive potential-energy curves is derived.

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“…The experiments were carried out at the U49-SGM-1 beam line where an energy resolution E/∆E > 10 4 is reached in the soft X-ray regime. 22 The cluster jet is crossed by the beam of monochromatic synchrotron radiation under collision free conditions in the ionization region of a time-of-flight mass spectrometer (TOF-MS). This device is used in a pulsed mode in order to separate and detect the cluster cations and their fragments.…”

Section: Methodsmentioning

confidence: 99%

High Resolution Near-Edge Spectroscopy of Molecules and Molecular Van Der Waals Clusters

et al. 2002

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High resolution near-edge excitation of isolated molecules and homogeneous molecular van der Waals clusters is reported. Resonant excitation near the element K-edges of isolated and clustered carbon monoxide and nitrogen gives rise to small spectral shifts that can only be detected by high spectral resolution. The experimental results indicate for the vibrationally resolved 1s → π * transitions of isolated molecules that symmetric line shapes cannot be used rather than the lifetime-broadened rotational fine structure. Clustered molecules exhibit characteristic redshifts of the order of a few meV relative to the corresponding isolated molecules. Changes in Franck-Condon factors and changes in spectral line shape are observed, as well. The experimental results are discussed in the framework of the quasiatomic approach with respect to intermolecular interactions and dynamic localization of resonant core-to-valence excitations.

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Performance of the first undulator beamline U49-1-SGM at BESSY II

Cited by 45 publications

References 3 publications

Hybridization and magnetism in small FePt alloy clusters

Hybridization and magnetism in small FePt alloy clusters

Probing dissociative molecular dications by mapping vibrational wave functions

High Resolution Near-Edge Spectroscopy of Molecules and Molecular Van Der Waals Clusters

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