Concept of multipole magnetic field rotation in ECRIS

The conventional type of magnetic well is formed by superposition of two types of magnetic field, axial bumpy field and radial multipole field. It is used to contain plasma that consists of neutrals, ions and electrons. These particles are in constant motion in the well and energetic electrons create plasma by violent collisions with neutrals and ions. The confined electrons are constantly heated by ECR technique in the presence of magnetic field. In this paper it has been shown theoretically that how the electron motion is influenced in terms of heating, containment and azimuthal uniformity of plasma, by the axial rotation of the multipole magnetic field [1,2]. Afterwards, the feasibility of achieving a rotating magnetic multipole field is discussed to some extent. And it is seen that it is not beyond the capability of the scientific community in the present scenario of the advanced technology. Presently, it can be achieved for lesser field and slightly larger size of the multipole electromagnet and can be used for improvement of the ECR ion source (ECRIS).     

Asymmetrische katalysen: XXVII. Rh-komplexe mit von tropolon abgeleiteten optisch aktiven liganden

In tropolone, the oxygen atoms were replaced stepwise by NC★ HMePh groups. The resulting compounds were introduced as anionic ligands into Rh(COD) complexes. The new ligands and complexes were analytically and spectroscopically characterized. The conformation of the NCH(Me)(Ph) substituent in the Rh(COD) complex of the troponiminate anion was determined by NOE ¹H NMR difference spectroscopy. Only small optical inductions were obtained in the asymmetric hydrosilylation of acetophenone with diphenylsilane using the in situ catalysts from [Rh(COD)Cl]₂ and the new ligands as well as the new complexes. The enantiomeric excess rose to 5 and 33%, respectively, when ( + )-norphos and (?) -diop were used as cocatalysts and the new complexes as procatalysts.     

Optisch aktive übergangsmetall-komplexe: LXXXV. Darstellung,eigenschaften und konformationsanalyse von optisch aktiven CpCo-Komplexen

The Schiff bases from 2-pyridine-carbaldehyde, 2-acetylpyridine, 2-benzoylpyridine, 2-pyrrole-carbaldehyde, and 2-acetylpyrrole with (?)-1-phenylethylamine and (?)-3-aminomethylpinane were synthesized. The pyridine Schiff bases αγ were used as neutral compounds and the pyrrole Schiff bases δHζH were used as anions δζ in the reaction with CpCo(CO)I₂ and CpCo(CO)(C₃F₇)I. In place of the covalently bonded iodine ligand different monodentate ligands bp were incorporated. Compounds of the type CpCo(αζ)(ap) and [CpCo(αζ)(ap)]X with X = I, PF₆ are formed.All the complexes consist of pairs of diastereomers differing only in the Co configuration. The diastereomers exhibit different ¹H NMR spectra. The Co configuration in all the compounds is labile except the C₃F₇ derivatives. A conformational analysis establishes which of the diastereomers is the thermodynamically more stable one, on the basis of the following arguments and methods: NOE-difference spectroscopy, diastereomer ratios at equilibrium, chemical shifts of the Cp signals, and CD spectra.     

Multielement investigation of human bile by means of instrumental neutron activation analysis

In a study on gold containing antirheumatic agents, the portion of gold that was eliminated via liver was quantified. Seven patients whose gall bladders had just been removed surgically received 5 tablets RIDAURA^® containing a total amount of 4.35 mg gold in the chemical compound Auranofin. In the following 7 days samples of hepatic bile were collected and analyzed by instrumental neutron activation analysis (INAA). After a 3-day irradiation with neutrons in the Research Reactor Geesthacht (FRG) and after a waiting time of 5–10 days, the limit of detection for gold was about 0.03 ng. The gold concentration in bile reached the maximum value (≈65 ng/ml) after about 16 hours and decreased with a biological half-life, first of 21 hours and later, in the end phase, of 6.5 days. Further elements were determined in the hepatic bile: Na, Ca, Fe, Co, Zn, Se, Br, Rb, Cs, Ba, Hg and sporadically K, Sc, Cr, Ni, Sb, La, Ce, Eu, Tb, Hf, Ta, Th. Some of these elements occurred in clusters. The blank values of the quartz ampoules and the precision, accuracy and limit of detection of these elements are given. The element concentrations found in bile are compared with those in plasma and classified after BRAUER.