Measurement of UNILAC and SIS18 proton performance

On July 16th 2016 the UNILAC and SIS18 proton performance has been measured. Due to scheduled maintenance works of the UNILAC's rf-system, the post-stripper energy was restricted to 5.9~MeV and accordingly the beam quality suffered considerably from the interruption of the periodic focusing system. This limitation will not be any longer in future beam times. Six single-gap resonators were used for acceleration to 10.7~MeV. After an optimization of the multi-turn injection $\pmb{1.2\cdot10^{11}}$ protons were extracted form the SIS18

Straight injection of an intense uranium beam into the GSI High Current RFQ

A dedicated high current uranium ion source and LEBT will be built at the GSI High Current Injector (HSI), to fulfil the intensity requirements for FAIR (Facility forAntiproton and Ion Research at Darmstadt). This new injection line will be integrated into the existingcomplex which already comprises two branches. The new LEBT is designed as a straight injection linewithout dipole magnet, i.e. without dispersive charge stateseparation. All uranium charge states, coming from theion source, are transported to the heavy ion high current GSI-HSI-RFQ. Only the design charge state U4+ is accelerated to the final RFQ energy. The new LEBT design is based on beam emittance and current measurements behind the existing ion source. Beam dynamics simulations have been performed with thecodes TRACE-3D (envelopes), DYNAMION,BEAMPATH and TRACK (multiparticle). The recentlayout of the LEBT, as well as the results of beam dynamics studies are presented

Zn-containing double complex salts formed by Keggin type polyoxotungstates: Synthesis and crystal structure

© 2017, Pleiades Publishing, Ltd. Novel double complex salts, [Zn(DMF) 6 ] 2 [SiW 12 O 40 ] · 2H 2 O (I) and [Zn(H 2 O) 2 (DMF) 4 ][Zn(DMF) 6 ] 2 [PW 12 O 40 ] 2 · 6DMF (II) (DMF = N,N-dimethylformamide), were prepared by the reaction of Zn 2+ and heteropoly acids H x [EW 12 O 40 ] · xH 2 O (E = P, X = 3, E = Si, X = 4) in DMF. Compounds I and II were studied by X-ray diffraction (СIF files CCDC nos. 1497570 (I) and 1497571 (II)) and IR spectroscopy

Heterogeneous bromination of alkenes using Bi(III) polybromide complexes as {Br<inf>2</inf>} source

© 2016 The Royal Society of Chemistry.A new polybromide Bi(iii) complex (PyH)3{[Bi2Br9](Br2)} was synthesized and characterized by XRD and other methods. This compound is able to act as a selective bromination agent towards various types of substituted alkenes

Crystal structures of binuclear Bi(III) chloride and bromide complexes with some cations — Alkylated pyridine derivatives

© 2017, Pleiades Publishing, Ltd. By a reaction of [BiX 6 ] 3– with salts of various N-alkylated pyridine derivatives in 2M HX (X = Cl, Br), (N-BzPy) 4 [Bi 2 X 10 ] complexes (X = Cl (1), Br (2), (4-MePyH) 4 [Bi 2 Cl 10 ] (3)) are obtained and structurally characterized

Time-dependent conduction current in lithium niobate crystals with charged domain walls

We present the experimental study of the increase and decrease of the abnormal conduction current appeared during polarization reversal at elevated temperatures (120-250 °C) in stoichiometric and MgO doped lithium niobate single crystals. It is shown that the conduction current is caused by existence of the through charged domain walls. The time dependence of the conduction current has been measured in low electric field immediately after partial switching. The maximal value of the conduction current in crystal with through charged domain walls is of 4-5 orders of magnitude higher than in initial single domain state. The activation energy is 1.1 eV. © 2013 AIP Publishing LLC

Bi(iii) immobilization inside MIL-101: enhanced photocatalytic performance

© The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.A novel hybrid material Bi(iii)@MIL-101 (Bi(iii) = Bi-containing oxoclusters and MIL-101 = chromium(iii) oxoterephthalate) was obtained by the intra-pore hydrolysis of guest bismuth(iii) chloride in ammonia solution. This compound was characterized by chemical analysis, powder X-ray diffraction, nitrogen sorption and TEM techniques. According to the obtained data all Bi species are located only inside the matrix. The framework structure remains intact during all synthetic operations. The chemical nature of Bi(iii)-containing clusters inside the MIL-101 matrix was suggested based on the EXAFS study. The catalytic activity of Bi(iii)@MIL-101 in photodegradation of methyl red (MR) has been tested. The introduction of Bi(iii)-species inside MIL-101 significantly increases the photocatalytic performance in comparison with layered BiOCl which was obtained under the same synthetic conditions without MIL-101

Complexes of non-lacunary Keggin- and Dawson-type polyoxometalates with Pb(ii): formation of 1D coordination polymers with different bonding modes

© The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.A new coordination polymer based on Keggin-type [SiW12O40]4- and Pb2+ ions, {Pb2(μ2-DMF)2(DMF)8(SiW12O40)} (1a), was prepared by a reaction between H4[SiW12O40] and Pb(NO3)2 in N,N-dimethylformamide (DMF). Varying the crystallization conditions, a complex with a slightly different coordination mode of the {Pb2} unit and solvate composition, {Pb2(μ2-DMF)2(DMF)8(SiW12O40)}·DMF (1b), can be obtained. The complex containing Well-Dawson polyoxoanions, {(Pb(μ2-DMF)3(DMF)6)(Pb(DMF)5)(P2W18O62)}·0.5DMF·1.3H2O (2), was prepared by a similar strategy