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  • 1
    Electronic Resource
    Electronic Resource
    Can multiple structures in positron spectra be caused by atomic effects? (1988)
    Springer
    The European physical journal 8 (1988), S. 305-313 
    Details
    ISSN: 1434-6079
    Keywords: 25.70 ; 34.50.F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In recent experiments at least two structures have been detected in positron spectra from subcritical (total chargeZ ≦ 174) heavy-ion collisions at bombarding energiesE Lab=5.7−5.9 MeV/n. The origin of these structures is unexplained up to now. Atomic effects have already been discussed as a possible source in a previous paper, where a schematic ansatz for the electronic transition matrix elements was employed. Meanwhile numerical calculations forK-vacancy formation also exhibited oscillations in the impact parameter dependence when using this ansatz. In this paper we report on a scaling law describing these oscillations. As a consequence certain subsidiary conditions have to be imposed on our schematic ansatz, which in turn yield a new understanding on eligible atomic sources for multiple structures in the emission spectra of positrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437096
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  • 2
    Electronic Resource
    Electronic Resource
    MO-radiation interference phenomena as a “clock” for nuclear reaction times (1986)
    Springer
    The European physical journal 1 (1986), S. 47-50 
    Details
    ISSN: 1434-6079
    Keywords: 34.50 ; 25.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Molecular orbitalK x-rays emitted during Pb+Pb collisions are investigated. Two results are presented: A slight filling up of the minimum observed in the differential radiation cross-section is given by radiative transitions from theM-shell to theL-shell. The minima are shifted with increasing nuclear contact times to higher photon energies. The observation of the shift allows the estimation of the sticking time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384657
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  • 3
    Electronic Resource
    Electronic Resource
    Models for new particle production in nuclear collisions (1986)
    Springer
    The European physical journal 324 (1986), S. 243-259 
    Details
    ISSN: 1434-601X
    Keywords: 13.90 ; 14.80 ; 25.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Following up our earlier work and also stimulated by recent experimental results on positron production in heavy ion collisions we investigate various mechanisms for the production of a light, previously unknown particle in such collisions. As more conventional mechanisms seem to be inadequate we concentrate on processes directly or indirectly connected with the strong electric or magnetic fields and quark degrees of freedom in nuclei. We also consider modifications of the color confinement scheme. Our analysis is confined to schemes staying within the framework of the standardSU(3)c ×SU(2)×U(1) model. Since most of the possibilities discussed can be rejected, severe modifications of basic concepts of particle physics seem to be required if the production of a new particle is confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294578
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  • 4
    Electronic Resource
    Electronic Resource
    Angular correlations of electron-positron pairs produced in heavy-ion collisions (1987)
    Springer
    The European physical journal 328 (1987), S. 81-84 
    Details
    ISSN: 1434-601X
    Keywords: 25.70 ; 34.50.F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate the strength of angular correlations between coincident electron-positron pairs produced in Pb + Pb collisions at 5.7 MeV/u. The angular correlations are predicted to be observable at electron energies above 200 keV, almost independent of positron energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01295185
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  • 5
    Electronic Resource
    Electronic Resource
    Darstellung und Struktur der Tetrafluoroaurate(III) MI[AuF4] mit MI = Li, RbProfessor Hans Georg von Schnering zum 60. Geburtstage gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 598 (1991), S. 103-110 
    Details
    ISSN: 0044-2313
    Keywords: Lithium, rubidium tetrafluoroaurate(III) ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Structure of Tetrafluoroaurates(III) MI[AuF4] with MI = Li, RbSingle crystal investigations on Rb[AuF4], light yellow, confirm the tetragonal unit cell (K[BrF4]-type) with a = 618.2(1) and c = 1191(1) pm, Z = 4, space group I 4/mcm-D4h18 (No. 140).Li[AuF4], light yellow too, crystallizes monoclinic with a = 485.32(7), b = 634.29(8), c = 1004.43(13) pm, β = 92.759(12), Z = 4; space group P 2/c-C2h4 (No. 13). The structure of Li[AuF4] is related to the Rb[AuF4]-type of structure.
    Notes: Einkristalluntersuchungen an Rb[AuF4], hellgelb, bestätigen die tetragonale Elementarzelle (K[BrF4]-Typ) mit a = 618,2(1) und c = 1191(1) pm, Z = 4, Raumgruppe I 4/mcm-D4h18 (Nr. 140).Ebenfalls hellgelbes Li[AuF4] hingegen kristallisiert monoklin (eigener Typ) in der Raumgruppe P 2/c-C2h4 (Nr. 13) mit a = 485,32(7), b = 634,29(8), c = 1004,43(13) pm, β = 92,759(12), Z = 4 und ist mit der Rb[AuF4]-Struktur verwandt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915980110
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Kristallstruktur von MnF3 und MnPtF6 (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1426-1430 
    Details
    ISSN: 0044-2313
    Keywords: Manganese fluorides ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Crystal Structure of MnF3 and MnPtF6Single crystal investigations of MnF3 (rubyred) confirmed the crystal structure based on powder data [2]: monoclinic, space group C 2/c-C2h6 (No. 15) with a = 892.02 pm, b = 504.72 pm, c = 1 347.48 pm, β = 92.64° with Z = 12.The corresponding determination of the crystal structure of MnPtF6, yellow, confirmed the unit cell [3] with a = 510.47 pm, c = 1 421.0 pm and γ = 120°, Z = 3 space group R 3-C3i2 (No. 148).For both compounds detailed parameters respectively interatomic distances have been obtained.
    Notes: Einkristalluntersuchungen an MnF3 (rubinrot) bestätigen den aus Pulverdaten [2] abgeleiteten Strukturvorschlag: monoklin, Raumgruppe C 2/c-C2h6 (Nr. 15) mit a = 892,02 pm, b = 504,72 pm, c = 1 347,48 pm, β = 92,64° mit Z = 12 (Vierkreisdiffraktometerdaten).Entsprechende Einkristalluntersuchungen an MnPtF6, hellgelb, bestätigen auch hier die Abmessungen der Elementarzelle [3] mit a = 510,47 pm, c = 1 421,0 pm und γ = 120°, Z = 3 in der Raumgruppe R °3-C3i2 (Nr. 148). Für beide Verbindungen konnten damit genaue Parameter bzw. interatomare Abstände ermittelt werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190818
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  • 7
    Electronic Resource
    Electronic Resource
    LiSmAlF6  -  das erste Fluoroaluminat mit zweiwertigem Samarium (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 606 (1991), S. 169-176 
    Details
    ISSN: 0044-2313
    Keywords: Lithium samarium hexafluoroaluminate ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: LiSmAlF6  -  the First Fluoroaluminate with Divalent SamariumLiSmAlF6, the first quaternary fluoride with Sm2+ that has been obtained as red transparent single crystals, is formed while heating corresponding mixtures of the starting materials in niobium or tantalum crucibles under argon after 7-10 d at about 800°C. Orange-red, microcrystalline powder samples of LiSmAlF6 could be prepared at T ≤ 700°C after 1-2 d under the same conditions.LiSmAlF6, crystallizes as a new structure type in P6322 (Nr. 182) with a = 507.9(1), c = 1 040.5(1) pm and Z = 2 (CAD4, 2 512 Io, Rw = 2,3%). The crystal structure of LiSmAlF6 is related to the LiCaAlF6 structure type whereby the essential difference lies in the coordination of the M2+ ions. Ca2+, as well as Sr2+ in LiSrAlF6, exhibit octahedral coordination, whereas Sm2+ has, surprisingly, trigonal prismatic coordination to F-. The two triangles of the SmF6 prism are twisted by 8.3° with respect to each other.Measurements of the magnetic susceptibility show the temperature dependence typically found for Sm2+. The Madelung part of the lattice energy has been calculated and is discussed.
    Notes: LiSmAlF6, das erste in Form roter, transparenter Einkristalle erhaltene quaternäre Fluorid mit Sm2+, bildet sich beim Erhitzen geeigneter Ausgangsmenge in Niob- oder Tantaltiegln unter Ar nach 7-10 d bei ca. 800°C. Orangerote, mikrokristalline Pulverproben von LiSmAlF6 können bei T ≤ 700°C bereits nach 1-2 Tagen unter sonst gleichen Bedingungen dargestellt werden.LiSmAlF6 kristallisiert in einem neuen Strukturtyp in P6322 (Nr. 182) mit a = 507,9(1), c = 1 040,5(1) pm und Z = 2(CAD4, 2 512 Io, Rw = 2,3%). Die Kristallstruktur von LiSmAlF6 ist dem LiCaAlF6-Typ verwandt, zeigt aber den wesentlichen Unterschied in der Umgebung für M2+ : Ca2+, wie auch Sr2+ in LiSrAlF6, werden oktaedrisch, Sm2+ jedoch überraschenderweise trigonal-prismatisch von F- koordiniert. Die beiden Dreiecke des SmF6-Prismas sind um 8,3° gegeneinander verdreht.Messungen der magnetischen Suszeptibilität zeigen die für Sm2+ typische Temperaturabhängigkeit. Der Madelunganteil der Gitterenergie wurde berechnet und diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19916060117
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  • 8
    Electronic Resource
    Electronic Resource
    Tetrafluoroaurate(III) der Lanthaniden MF[AuF4]2 (M = Tm, Yb, Lu) (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1661-1668 
    Details
    ISSN: 0044-2313
    Keywords: Rare earth tetrafluoroaurates(III) ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tetrafluoroaurates(III) of Lanthanides MF[AuF4]2 (M = Tm, Yb, Lu).Tetrafluoroaurates(III) MF[AuF4]2 with M = Tm, Yb, Lu, all yellow, have been prepared for the first time. From single crystal data they crystallize orthorhombic, space group Pbcn-D2h14 (No. 60) with M = Tm: a = 1 102.92(8) pm, b = 904.38(8) pm, c = 2 164.46(23) pm; M = Yb: a = 1 100.98(12) pm, b = 902.23(8) pm, c = 2 157.36(23) pm; M = Lu: a = 1 099.28(18) pm, b = 900.70(15) pm, c = 2 151.50(46) pm.
    Notes: Neu dargestellt wurden gelbe Tetrafluoroaurate(III) der Lanthaniden MF[AuF4]2 mit M = Tm, Yb, Lu. Nach Einkristalluntersuchungen kristallisieren diese orthorhombisch in der Raumgruppe Pbcn-D2h14 (Nr. 60) mit Z = 12. Im Einzelnen wurden folgende Werte gefunden: Für M = Tm: a = 1 102,92(8) pm, b = 904,38(8) pm, c = 2 164,46(23) pm; M = Yb: a = 1 100,98(12) pm, b = 902,23(8) pm, c = 2 157,36(23) pm; M = Lu: a = 1 099,28(18) pm, b = 900,70(15) pm, c = 2 151,50(46) pm.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936191004
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