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  • 1
    Electronic Resource
    Electronic Resource
    Multiple trim magnets, or "magic fingers,'' for insertion device field integral correction : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1901-1903 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Multiple trim magnets (MTMs), also known as "magic fingers,'' are an arrangement of magnets for reducing integrated magnetic-field errors in insertion devices. The idea is to use transverse arrays of permanent magnets, hence the name "multiple trim magnets,'' above and below the midplane, to correct both normal and skew longitudinal magnetic-field integral errors in a device. MTMs are typically installed at the ends of an ID. Adjustments are made by changing either the size, position, or orientation of each trim magnet. Application of the MTMs to the ALS undulators reduced both the normal and skew longitudinal field integral errors, over the entire 20 mm×60 mm "good field region,'' of the beam aperture by as much as an order of magnitude. The requirements included corrections of field and gradients outside the multipole convergence radius. Additionally, these trim magnet arrays provided correction of the linear component of the integrated field gradients for particles with trajectories not parallel to the nominal beam axis. The MTM concept, design, construction, tests that demonstrated feasibility, and magnetic-field integral reduction of ALS undulators are presented. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145818
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  • 2
    Electronic Resource
    Electronic Resource
    Elliptically polarizing undulator beamlines at the Advanced Light Source : The 9th National conference on synchrotron radiation instrumentation (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3372-3372 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Circular polarization insertion devices and beamlines at the Advanced Light Source are described. The facility will consist of multiple undulators feeding two independent beamlines, one optimized for microscopy and the other for spectroscopy. The energy range of the beamlines will go from below 100 eV to 1800 eV, enabling studies of the magnetically important L2,3 edges of transition metals and the M4,5 edges of rare earths. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147337
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  • 3
    Electronic Resource
    Electronic Resource
    Undulators at the Advanced Light Source : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1898-1900 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: At Lawrence Berkeley Laboratory's Advanced Light Source, three 4.6 m long undulators have been completed, tested, and installed. A fourth is under construction. The completed undulators include two 5.0 cm period length, 89 period devices (U5.0s) which achieve a 0.85 T effective field at a 14 mm minimum gap and a 8.0 cm period length, 55 period device (U8.0) that reaches a 1.2 T effective field at a 14 mm minimum gap. The undulator under construction is a 10.0 cm period length, 43 period device (U10.0) that is designed to achieve 0.98 T at a 23 mm gap. Undulator magnetic gap variation (rms) is within 25 μm over the periodic structure length. Reproducibility of the adjustable magnetic gap has been measured to be within ±5 μm. Gap adjusting range is from 14 to 210 mm, which can be scanned in 1 min. The 5.1 m long vacuum chambers are flat in the vertical direction to within 0.74 mm and straight in the horizontal direction to within 0.08 mm over the 4.6 m magnetic structure sections. Vacuum chamber base pressures after UHV beam conditioning are in the mid-10−11 Torr range and storage ring operating pressures with full current are in the low 10−10 Torr range. Measurements show that the uncorrelated magnetic field errors are 0.23% and 0.20% for the two U5.0s and the U8.0, respectively, and that the field integrals are small over the 1 cm×6 cm beam aperture. Device description, fabrication, and measurements are presented. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146462
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  • 4
    Electronic Resource
    Electronic Resource
    Advanced Light Source elliptical wiggler : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1895-1897 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A 3.5-m-long elliptical wiggler, optimized to produce elliptically polarized light in the 50 eV to 10 keV range, is currently under design and construction at the Advanced Light Source at Lawrence Berkeley Laboratory. Calculations of spectral performance show that the flux of circularly polarized photons exceeds 1013 photons/s over the 50 eV to 10 keV operating range for current of 0.4 A and 1.5 GeV electron energy. This device features vertical and horizontal magnetic structures of 14 and 141/2 periods, respectively. The period length is 20.0 cm. The vertical structure is a hybrid permanent magnet design with tapered pole tips that produce a peak field of 2.0 T. The horizontal structure is an iron core electromagnetic design, shifted longitudinally 1/4 period, that is tucked between the upper and lower vertical magnetic structure sections. A maximum peak oscillating field of 0.095 T at a frequency up to 1 Hz will be achieved by excitation of the horizontal poles with a trapezoidal current waveform. The vacuum chamber is an unconventional design that is removable from the magnetic structure, after magnetic measurements, for UHV processing. The chamber is fabricated from non-magnetic stainless steel to minimize the effects of eddy currents. Device design is presented. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145817
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular and Crystal Structures of New Binuclear Thiooxalate-Bridged Complexes: (.mu.-Trithiooxalato-S,S':S',S'')bis[bis(triphenylphosphine)silver(I)], the First Verified Simultaneously End-on/Side-on Coordinated Thiooxalate, and (.mu.-1,1-Dithiooxalato-S,O:S',O')bis[bis(triphenylphosphine)metal(I)] (Metal = Copper, Silver) (1995)
    s.l. : American Chemical Society
    Inorganic chemistry 34 (1995), S. 763-766 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00108a004
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  • 6
    Electronic Resource
    Electronic Resource
    Angenäherte Berechnung der Dreizentren-Kernanziehungsintegrale in LCAO-MO-Verfahren für Koordinationsverbindungen (1972)
    Springer
    Theoretical chemistry accounts 25 (1972), S. 319-330 
    Details
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Bei der Berechnung der Nichtdiagonalelemente in LCAO-MO-Verfahren für Koordinationsverbindungen treten Dreizentren-Kernanziehungsintegrale vom Typ (χ a ¦1/r c ¦χb) auf. Wir geben ein einfaches Verfahren zur näherungs weisen Berechnung dieser Integrale an. das auf der hohen Symmetrie der Koordinationsverbindungen beruht. Die Dreizentrenintegrale werden auf eine Summe von wenigen speziellen Zweizentrenintegralen zurückgeführt.
    Notes: Abstract At the calculation of non-diagonal elements in LCAO-MO-methods for coordination compounds arise three-center nuclear attraction integrals of type(χ a ¦1/r c ¦χb) We give a simple method for the approximate calculation of these integrals which is based on the high symmetry of the coordination compounds. The three-center integrals are reduced to a sum of few special two-center integrals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00526563
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  • 7
    Electronic Resource
    Electronic Resource
    Intestinal perforation during simultaneous lactose tolerance test and motility investigation (1973)
    Springer
    Digestive diseases and sciences 18 (1973), S. 65-66 
    Details
    ISSN: 1573-2568
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case of intestinal perforation, in a patient without lactose malabsorption but with Crohn's disease in the terminal ileum, which occurred during simultaneous lactose tolerance test and investigation of intestinal tract motility by use of a radio pill is reported. The mechanism is assumed to be the intestinal motility accentuated by the lactose administration in spite of normal absorption of lactose, so that the radio pill was ejected through the intestinal wall proximal to the affected segment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01072240
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  • 8
    Electronic Resource
    Electronic Resource
    Diselenocarbamate als Liganden in Schwermetallchelaten (1970)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 378 (1970), S. 144-151 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New synthesized chelates of Diselenocarbamates with the tripositive forms, of Ga, In, Tl, Au, Rh, Fe, Cr, Mn and Co (Tris-complexes), the dipositive of Ni, Cu, Pt, Pd (Bis-complexes) and tetravalent U (Tetrakis-complex) have been characterized chemically, spectroscopically (UV, vis) and EPR spectroscopically. OsIV and RuIV are reduced by the ligand and form Tris-chelates of the tripositive ions
    Notes: Es wird über chemische, elektronenspektroskopische und ESR-spektroskopische Ergebnisse an neutralen Diselenocarbamatchelaten von GaIII, InIII, TlIII, AuIII, RhIII, FeIII, CrIII, MnIII, CoIII (Tris-Komplexe), NiII, CuII, PtII, PdII (Bis-Komplexe) und UIV (Tetrakiskomplex) berichtet. OsIV und RuIV werden vom Liganden reduziert, und die dreiwertigen Ionen bilden Tris-Chelate. Die Ergebnisse werden mit Aussagen über die Ligandeneigenschaften von Dithiocarbamaten verglichen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19703780203
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  • 9
    Electronic Resource
    Electronic Resource
    ESR-Untersuchungen an Silber(II)-bis-(di-n-butyl-diselenocarbamat)-Einkristallen (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 386 (1971), S. 213-220 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A single crystal EPR study of Ag(II)-bis-(di-n-butyl-diselenocarbamate) is reported. The symmetry of the g-tensor and the silver hyperfinestructure tensor A is rhombically; the principal values of the tensors are given. The degree of covalency of the ground state σ-bond was determined by use of the observed 77Se ligand hyperfine interaction. The maximum component of the g-tensor does not coincide with the Az value of the silver hfs. This indicates, that there are significant deviations in the electronic structure to what is expected for a square planar silver(II) complex: the over-all symmetry of the coordination sphere is C2h. In addition, the structure has been found as being similar to the analogous copper(II) dialkyl-diselenocarbamates.
    Notes: Es wird über eine ESR-Einkristalluntersuchung von Ag(II)-bis-(di-n-butyl-diselenocarbamat) berichtet. Die Symmetrie des g-Tensors und des Silberhyperfeinstrukturtensors A ist rhombisch. Mit Hilfe der beobachteten 77Selen-Ligandenhyperfeinstruktur wurde der Kovalenzgrad der Grundzustands-σ-Bindung bestimmt. Die maximale Komponente des g-Tensors fällt nicht mit dem Az-Wert der Silber-hfs zusammen. Daraus folgt, daß die Elektronenstruktur des Komplexes signifikant von der eines quadratisch planaren Silber(II)-Komplexes verschieden ist; die Gesamtsymmetrie der Koordinationssphäre ist C2h. Die Struktur ist damit ähnlich der der analogen Kupfer(II)-dialkyl-diselencarbamate.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713860213
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  • 10
    Electronic Resource
    Electronic Resource
    ESR-Untersuchung zur Existenz von Silber(II)- und Gold(II)-bis-(dialkyi-diselenocarbamaten) (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 160-168 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The existence of silver(II) and gold(II) bis-(dialkyl-diselenocarbamate) has been proved EPR-spectroscopically (solution and - Ag(II) - powder spectra). In the EPR powder spectra for the silver (II) chelates the Ag-hfs-tensor and also the g-tensor exhibit rhombic symmetry. The important contribution of the spin-orbit interaction in the selenium atoms to the g-tensor and the strong π-covalence of the d9-metal-Se bond cause low g-values which are near to the free-electron g-value. The 77Se-ligand-hfs is used to estimate the degree of covalency of the groundstate σ-bond. In the series Cu, Ag, An the contribution of the isotropic hyperfine interaction increases strongly in agreement with an increased admixture of s-orbitals to the groundstate MO of the unpaired electron.
    Notes: Die Existenz von Silber(II)- und Gold(II)-bis-(dialkyl-diselenocarbamaten) wird ESR-spektroskopisch in Lösung bzw. Ag(II) auch in Pulvern nachgewiesen. Die ESR-Pulverspektren der Ag(II)-Chelate zeigen, daß sowohl der Ag-Hyperfeinstrukturtensor wie auch der g-Tensor rhombische Symmetrie besitzen. Der große Beitrag der Spin-Bahn-Wechselwirkung in den Selenatomen zum g-Tensor und die starke π-Kovalenz der d9-Metall-Se-Bindung verursachen ein Absinken der g-Werte in die Nähe des g-Wertes des freien Elektrons. Die 77Se-Ligandenhyperfeinstruktur wurde zum Abschätzen des Kovalenzgrades der Grundzustands-σ-Bindung benutzt. Der in der Reihe Cu. Ag Au stark anwachsende Beitrag der isotropen Hyperfeinstruktur-Wechselwirkung weist auf ansteigende Beimischung von s-Orbitalen in das einfach besetzte Grundzustands-MO hin.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713840211
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