A5052281733- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Mass Spectrometry Techniques and Applications
- Atomic and Molecular Physics
- Supramolecular Chemistry and Complexes
- Magnetism in coordination complexes
- Solid-state spectroscopy and crystallography
- Particle accelerators and beam dynamics
- Polyoxometalates: Synthesis and Applications
- Organometallic Complex Synthesis and Catalysis
- Porphyrin and Phthalocyanine Chemistry
- Inorganic Chemistry and Materials
- Particle Accelerators and Free-Electron Lasers
- Layered Double Hydroxides Synthesis and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Optical Systems and Laser Technology
- Crystallography and molecular interactions
- Chemical Synthesis and Characterization
- Nuclear Physics and Applications
- Crystal Structures and Properties
- Advanced Measurement and Detection Methods
- Advanced optical system design
- Synthesis and Properties of Aromatic Compounds
- Lanthanide and Transition Metal Complexes
- Zeolite Catalysis and Synthesis
University of Konstanz
2016-2020
European Organization for Nuclear Research
2012-2018
Max Planck Institute for Nuclear Physics
2014
Heidelberg University
2012
Justus-Liebig-Universität Gießen
1973
University of Arizona
1965
The radioactive element astatine exists only in trace amounts nature. Its properties can therefore be explored by study of the minute quantities artificially produced isotopes or performing theoretical calculations. One most important influencing chemical behaviour is energy required to remove one electron from valence shell, referred as ionization potential. Here we use laser spectroscopy probe optical spectrum near threshold. observed series Rydberg states enabled first determination...
The resonance ionization laser ion source (RILIS) produces beams for the majority of experiments at ISOLDE on-line isotope separator. A substantial improvement in RILIS performance has been achieved through a series upgrade steps: replacement copper vapor lasers by Nd:YAG laser; old homemade dye new commercial lasers; installation complementary Ti:Sapphire system. combined and system with harmonics is capable generating any wavelength range 210–950 nm. In total, isotopes 31 different...
Abstract Na 8 Ga 2 O 7 , neu dargestellt, kristallisiert monoklin mit a = 8,65 0 b 10,98 5 c 10,04 3 Å, β 107,6°, Z 4 in der Raumgruppe P2 1 /c‐C 2h ; alle Teilchen liegen auf Punktlage 4(e) Parameter vgl. Text. Die Struktur zeigt „isolierte”︁[Ga ]‐Gruppen, die durch + miteinander verbunden sind. Der MADELUNG‐Anteil Gitterenergie, MAPLE, wird berechnet und diskutiert.
Interference of fine-structure levels in hydrogen ions passing through two successive carbon foils
Tetraruthenium macrocycles with 1,4-divinylphenylene and diarylamine-substituted isophthalic acids as the sides display up to eight one-electron redox steps rich electrochromic behaviour strong absorptions of dications in near infrared tetra- hexacations at low energies visible.
Two volume sources equipped with DESY and CERN plasma generators a low voltage electron dump were operated at 45 kV in the Linac4 tunnel on dedicated test stand. These delivered approximately 20 mA ensured commissioning of Radio Frequency Quadrupole accelerator first section Drift Tube Linac. CERN's prototype cesiated surface source this was continuously from November 2013 to April 2014 ion stand is being commissioned tunnel. Before cesiation, conditioned mode provided up 30 H− beam. Short...
Abstract Na 5 GaO 4 , neu dargestellt, kristallisiert orthorhombisch mit a = 10,26 3 b 5,95 0 c 18,06 Å, Z 8 in der Raumgruppe Pbca—D ; alle Teilchen liegen 8(c)‐Parameter vgl. Tab. 2. Die Struktur zeigt isolierte [GaO ]‐Tetraeder, die über + ‐Ionen verknüpft sind. Der Madelung‐Anteil Gitterenergie MAPLE wird berechnet und diskutiert.
Self-assembly of a divinylthiophene-bridged diruthenium complex with 2,5-furandicarboxylate leads to the formation two macrocyclic structures that differ solely regard their respective nuclearities. Both supramolecular isomers were fully characterized and conversion hexa- tetraruthenium macrocycle was followed by NMR monitoring.
We report on five tetranuclear metallamacrocycles with particularly large inner voids of up to 19.4 × 18.9 Å. The macrocyclic complexes were obtained by the self-assembly spatially extended organic dicarboxylate linkers two different dinuclear bis(alkenyl) diruthenium precursors. include one pair constitutional isomers, 2-NB and 2-BN, which differ respect whether incorporated triarylamine functionality is part "conductive" π-conjugated (2-NB) or insulating (2-BN). All characterized NMR...
5-Ethynyl-2-furancarboxylic acid and 3-ethynylbenzoic self-assemble with [HRu(CO)Cl(PiPr3 )2 ] to form macrocyclic C3 -symmetric triangular triruthenium alkenyl complexes [{Ru(CO)(PiPr3 (CH=CHArCOO)}3 (Ar=C6 H4 : 1-B, Ar=C4 H2 O: 1-F), which were characterized by multinuclear NMR spectroscopy, high-resolution ESI mass spectrometry, and, in the case of X-ray crystallography. Electrochemical studies indicate that macrocycles are oxidized three consecutive one-electron steps. The mixed-valent...
Two constitutionally isomeric tetraruthenium macrocycles were constructed from either symmetrically (2-S) or unsymmetrically (2-A) functionalized thiophene-based building blocks. Both compounds fully characterized by NMR spectroscopy and high-resolution ESI MS. Despite their identical composition close structural resemblance, the two isomers exhibit vastly different electrochemical spectroscopic properties as a consequence of extensions π-conjugated subunits. In particular, mixed-valent...
Linac4 is a 160 MeV linear H− accelerator at CERN. It an essential part of the beam luminosity upgrade Large Hadron Collider (LHC) and will be primary injector into chain circular accelerators. aims increasing brightness by factor 2, when compared to currently used 50 proton accelerator, Linac2. Linac4's ion source cesiated RF-plasma source. Several extraction systems were designed for beams 45 keV energy, mA intensity electron ratio smaller than 5. The goal was extract with rms-emittance...
We report on six macrocyclic tetra‐ and hexaruthenium complexes formed by the self‐assembly of 2,5‐divinylthiophene‐ or 2,5‐divinylfuran‐bridged diruthenium 2,5‐thiophene‐, ‐furan‐ ‐pyrroledicarboxylate linkers. All were scrutinized NMR spectroscopy UHR ESI‐MS, cyclic square wave voltammetry and, in five cases, X‐ray diffraction analyses. Although utilized building blocks differ only slightly with respect to their intrinsic bite angles, resulting macrocycles exhibit remarkable structural...
We present the coordination-driven self-assembly of three tetranuclear metallacycles containing intracyclic NH2, OH, or OMe functionalities through combination various isophthalic acid building blocks with a divinylphenylene diruthenium complex. All new complexes this study were characterized by means nuclear magnetic resonance spectroscopy, ultrahigh-resolution ESI mass spectrometry, cyclic and square wave voltammetry and, in two cases, X-ray diffraction. The hydroxy functionalized...
Abstract Aus Gemengen Na 2 O/Tl O 3 mit : Tl = 5,4: 1 entsteht beim Tempern [Ag‐Bömbchen, 620°C, 7d] 5 TlO 4 , in intensiv gelben, derben, orthorhombischen Einkristallen: die Li GaO isotyp sind, Parameter siehe Text. Der Madelunganteil der Gitterenergie, MAPLE, Mittleren Fiktiven Ionenradien, MEFIR, und Effektiven Koordinationszahlen ECoN, werden berechnet diskutiert. Beim thermischen Abbau vorher unbekanntes gelbes aus diesem dann rotes NaTlO .
The development of the Linac 4 and its integration into CERN's acceleration complex is part foreseen luminosity upgrade Large Hadron Collider (LHC). goal to inject a 160 MeV H− beam CERN PS Booster (PSB) in order increase brightness by factor 2 compared 50 proton linac, 2, that currently operation.
Abstract Rb 2 In 4 O 7 , neu dargestellt, kristallisiert trigonal mit a = 5,62 8 c 7,34 0 Å, c/a 1,30, Z 1 in der Raumgruppe D –P 3 1m. Parameter und Punktlagen siehe Text. Die Struktur leitet sich von einer kubisch dichtesten Kugelpackuug 2‐ bei 3+ 1/9 aller Tetraeder‐ 2/9 Oktaederlücken besetzt. ersetzt 2/3 Teilchen jeder dritten Schicht. Der MADELUNGS‐Anteil Gitterenergie (MAPLE)wird berechnet diskutiert.