A short-pulse facility for time and angle-resolved photoe-mission experiments at the synchrotron light source DELTA

At the synchrotron light source DELTA (TU Dortmund), a short-pulsefacility is under commissioning. The U250 undulator of the storage ringis used to generate coherent sub-ps pulses at higher harmonics of aseeding laser. The VUV beamline BL5 operated by a group from PGI-6 (FZ Julich) ̈ guides those pulses into an end-station that is optimizedfor angle and spin-resolved photoemission spectroscopy experiments.A part of the seeding laser pulse is brought into the end-station via aseparate beamline and can be used as a pump beam for pump-probeexperiments. With those time and angle-resolved photoemission exper-iments that are now feasible with this unique setup we will, in the nearfuture, study magnetization dynamics of thin ferromagnetic films onmetal surfaces.The modifications of the photoemission setup that were necessaryto conduct time-resolved experiments and the current status of theshort-pulse facility will be described

Electronic Communication in C(4)-Bridged Binuclear Complexes with Paramagnetic Bisphosphane Manganese End Groups.

Building blocks for conducting polymers or NLO materials are the linear, unsaturated carbon chain bridged manganese complexes 1(n+) (n=0-2). All oxidation states were investigated spectroscopically and by X-ray structure determinations. The analytical data confirm a communication of the electrons over the C(4) chain-a prerequisite for electrical conductivity and NLO properties of oligo- or polymeric materials

Progress on the PITZ TDS

A transverse deflecting system (TDS) is under commissioning at the Photo Injector Test Facility at DESY, Zeuthen site (PITZ). The structure was designed and manufactured by the Institute for Nuclear Research (INR RAS, Moscow, Russia) as prototype for the TDS in the injector part of the European XFEL. Last year the deflection voltage was limited for safety reasons, but after thorough investigations of the waveguide system we are now able to operate the cavity close to design specifications. The PITZ TDS streaks the electron beam vertically, allowing measurements of the longitudinal bunch profile, and, in combination with a subsequent horizontal bending magnet, also of the longitudinal phase space and slice energy spread. Furthermore, several quadrupole magnets and screen stations can be employed for slice emittance measurements using the TDS. This paper describes the progress in commissioning of the hardware, measurement techniques and simulations, and outlines the prospects of reliable slice emittance measurements at 20 MeV/c, where space charge forces complicate the determination of transfer matrices

Trägerfixierte Metallodendrimere: isolierte Moleküle im Nanomaßstab

Die Einführung von Dialkylsulfidseitenketten in Metallodendrimere ist eine einfache Strategie für deren Einbau in eine Decanthiolmonoschicht, die zuvor durch Selbstorganisation auf einer Goldoberfläche gebildet wurde. Über den Sulfidanker kann das Dendrimer in Defektstellen der Monoschicht an das Goldsubstrat binden (siehe Bild). Die Oberflächenkonzentration der isolierten Dendrimeradsorbate kann über die Adsorptionszeit gesteuert werden (z.B. 55 Adsorbate auf einer Fläche von 200×200 nm2 nach 20 h