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  • Organic Chemistry  (14)
  • Ion implantation  (2)
  • 21.10  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Structure of negative-parity states in68Ge (1993)
    Springer
    The European physical journal 347 (1993), S. 15-20 
    Details
    ISSN: 1434-601X
    Keywords: 21.10 ; 27.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A microscopic description of negative parity states in the nucleus68Ge is presented. The investigation is based on the EXCITED VAMPIR model in which via a chain of variational calculations first an optimal configuration space ofi symmetry-projected Hartree-Fock-Bogoliubov determinants for thei lowest states of a given symmetry is constructed and subsequently the residual interaction is diagonalised. Though some considerable quantitative discrepancies are obtained, qualitatively the theoretical results agree rather nicely with the complex pattern of negative parity states in this nucleus which has been recently found experimentally. Underlying structures and electromagnetic properties are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01301271
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  • 2
    Electronic Resource
    Electronic Resource
    Damage dependent electrical activation of boron implanted silicon (1974)
    Springer
    Applied physics 3 (1974), S. 321-324 
    Details
    ISSN: 1432-0630
    Keywords: Ion implantation ; Profiles ; Damage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The important role of damage dependent electrical activation in the case of boron implanted silicon layers is whown by comparing measured acceptor concentration profiles in differently amorphized silicon layers. It is shown that the amorphous layer is completely recrystallized after a 650° C anneal for 10 min and the implanted boron is electrically active. In the heavily damaged but not amorphous region underneath the amorphous layer the implanted boron is hardly electrically active after this temperature treatment. At higher annealing temperatures the electrical activity increases, but 900° C are required for complete activation of the implanted boron. These results indicate that the process to activate the implanted boron electrically is strongly damage dependent. We thus found a new contribution to the understanding of the annealing behavior of implanted layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00887282
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  • 3
    Electronic Resource
    Electronic Resource
    Electrical and backscattering measurements of arsenic implanted silicon (1974)
    Springer
    Applied physics 4 (1974), S. 115-123 
    Details
    ISSN: 1432-0630
    Keywords: Ion implantation ; Backscattering ; Profiles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Measurements of doping concentration and mobility of arsenic implanted silicon at high energies and at low energies with following drive-in diffusion are presented. The electrical measurements are compared with and supported by backscattering measurements. Tails which are present after short time anneals vanish during drive-in diffusion. A temperature of at least 825°C is required to fully activate the arsenic and to obtain the same mobility as in diffused samples. Backscattering data reveal an anomaly in the annealing behavior of the damage. After prolonged annealing As shows some accumulation at the surface. For drive-in diffusions lattice location experiments were performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00884266
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Claisen-Umlagerung II. (Versuche mit 14C, 3. Mitteilung) (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 489-500 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei Studien der para-Claisen-Umlagerung mit Hilfe von 14C-markiertem Allyl-[2,6-dimethyl-phenyl]-äther liess sich durch Kreuzexperimente und durch Abbau des Allyläthers und seines Umlagerungsproduktes zeigen, dass die para-Umlagerung streng intramolekular und ohne Inversion des Allylrestes verläuft.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360218
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Claisen-Umlagerung I. (Versuche mit 14C, 2. Mitteilung (1952)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 35 (1952), S. 1879-1890 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Ausgehend von radioaktivem kaliumeyanid wurde der p-Kresyl-allyläther hergestellt, in dem das γ-C-Atom durch 14C markiert ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19520350612
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Claisen-Umlagerung III. Versuche mit 14C, 4. Mitteilung (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 687-690 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Photolyse (25°) von 14C-Allyl-(2,6-dimethyl-phenyl)-äther mit 97,4% der Radioaktivität im γ-C-Atom des Allylrestes entstand neben 2,6-Dimethylphenol in 1,4-proz. Ausbeute 2,6-Dimethyl-4-allylphenol, in dem die Radioaktivität auf das α- und das γ-C-Atom ungefähr gleichmässig verteilt ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360320
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  • 7
    Electronic Resource
    Electronic Resource
    Der sterische Verlauf der thermischen Zersetzung von unsymmetrischen quartären Dimethylammoniumsalzen. Versuche mit 14C: 8. Mitteilung (1956)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 39 (1956), S. 394-400 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: N-Methyltropiniumchlorid, in welchem eine der beiden unsymmetrisch angeordneten N-Methylgruppen durch 14C signiert war, gab bei der thermischen Zersetzung Tropin und Methylchlorid von ungefähr gleicher molarer Radioaktivität. Die Abspaltung verläuft somit stereounspezifisch. Aus einem Kreuzversuch folgte, dass die eigentliche Abspaltungsreaktion von gleichfalls nicht stereospezifisch verlaufenden Rekombinations- oder Ummethylierungsreaktionen begleitet ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19560390207
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  • 8
    Electronic Resource
    Electronic Resource
    Die Reversibilität der para-Claisen-Umlagerung. Zur Kenntnis der Claisen-Umlagerung VI (1956)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 39 (1956), S. 555-563 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurde gezeigt, dass sich 2, 6-Dimethyl-4-allyl-[γ-14C]-phenylallylather beim Erhitzen auf 168° in ein mit dem Ausgangsmaterial chemisch identisches Produkt umlagert, in welchem die Radioaktivität zu gleichen Teilen in den γ-C-Atomen des O- und C-Allylrestes lokalisiert ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19560390228
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  • 9
    Electronic Resource
    Electronic Resource
    Über den Mechanismus der thermischen Umlagerung von [2-Propenyl-4, 6-disubstituiertem-phenyl]-allyläthern in 2-[β-Methyl-penta-α, δ-dienyl]-4,6-disubstituierte Phenole. Zur Kenntnis der Claisen-Umlagerung VII (1956)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 39 (1956), S. 708-721 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der thermischen Umlagerung von [2-Propenyl-4,6-dimethyl-phenyl]-allyl-[γ-14C]-äther entst and ein 2-[P-Methyl-penta-α, δ-dienyl]-4,6-dimethyl-phenol, in welchem 84% der Radioaktivität im α- und 16% im γ-C-Atom der Pentadienyl-Seitenkette lokalisiert waren. Das Resultat eines Kreuzversuches spricht dagegen, dass diese Radioaktivitätsverteilung auf Radikalreaktionen zurückzuführen ist. Die möglichen unimolekularen Mechanismen dieser Seitenkettenumlagerung von Aryl-allyläthern aerden diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19560390311
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  • 10
    Electronic Resource
    Electronic Resource
    Über die Synthese von Phosphamidon und seinen Abbau in Pflanzen (1961)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 44 (1961), S. 1622-1645 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of phosphamidon, a new systemic insecticide, is describcd. By use of the 14C-labeled compound it is shown that in the bean plant phosphamidon undergoes rapid degradation, during which traces of the metabolites desethylphosphamidon,α-chloroacetoaceto-diethylamide, and α-chloroacetoaceto-ethylamide only are detectable. In order to explain the mechanism of the degradation reactions, the behaviour of phosphamidon towards acids and bases has been studied.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19610440621
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