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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 42 (1987), S. 125-127 
    ISSN: 1432-0630
    Keywords: 61.80 ; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Positron-lifetime measurements have been used to study the annealing of vacancies in neutron-irradiated GaAs. The vacancies which are interpreted as defects in the Ga sublattice disappear in a single annealing stage (at 500°C in GaAs doped with Si or Zn, and at 600°C in Cr-doped GaAs).
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 593 (1991), S. 137-146 
    ISSN: 0044-2313
    Keywords: Trimercaptosulfonium Salts ; Syntheses ; IR, Raman Spectra ; ab initio Calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of Trimercaptosulfonium Salts [S(SH)3]+AsF6- and [S(SH)3]+SbCl6-The preparation of the trimercaptosulfonium salts [S(SH)3]+AsF6- and [S(SH)3]+SbCl6- from SCl3+ salts with excessive H2S at 193 K is reported. The [S(SH)3]+SbCl6- is transferred into [S(SCl)3]+SbCl6- by reaction with Cl2 at low temperatures.The new [S(SH)3]+ cation is isoelectronic to P(PH2)3. In addition, its existence is supported by an ab-initio calculation. The results show a potential well for C3v configuration with SH bonds bended towards the top of the pyramid for the isolated ion. Also the results of a force-field calculation are reported.
    Notes: Die Darstellung der Trimercaptosulfoniumsalze [S(SH)3]+AsF6- und [S(SH)3]+SbCl6- erfolgt aus SCl3+-Salzen mit überschüssigem H2S bei 193 K. Durch Reaktion mit Cl2 bei tiefen Temperaturen wird [S(SH)3]+SbCl6- in [S(SCl)3]+SbCl6- überführt.Das neuartige [S(SH)3]+-Kation ist mit P(PH2)3 isoelektronisch und seine Existenz wird durch eine ab-initio-Rechnung unterstützt. Sie ergibt für das isolierte Ion eine Potentialmulde bei einer C3v-Konfiguration mit nach oben abgewinkelten SH-Bindungen. Weiterhin werden die Ergebnisse einer Kraftfeldberechnung mitgeteilt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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