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  • 1
    ISSN: 1434-4475
    Keywords: N-Alkoxybenzaldimines ; Electron impact ionization ; Distonic ions ; Ring closure ; Homolytic aromatic substitution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung N-Butoxy- und N-Propoxy-imine auso-,m-, undp-substituierten Benzaldehyden (X=F, Cl, Br, I) zersetzen sich unter Elektronenbeschuß durch Verlust von C n H2n zu den entsprechenden Aldoximen. In einer Konkurrenzreaktion entstehen über 1,5-distonische Radikalkationen durch Abspaltung von CH2O 1,3-distonische Ionen, die im Verlauf einer homolytischen aromatischen Substitution H2022 und/oder ein Halogenatom eliminieren, wodurch cyclische (M-CH2O-H•)+-oder (M-CH2O-X •)+-Ionen gebildet werden.
    Notes: Summary N-Butoxy- and N-propoxy-imines derived fromo-,m-, andp-substituted benzaldehydes (X = F, Cl, Br, I) decompose upon electron impact to the respective aldoximes by loss of C n H2n and competitivelyvia 1,5-distonic radical cations by loss of CH2O to 1,3-distonic ions which eliminate H• and/or a halogen atom in the course of homolytic aromatic substitution, giving rise to cyclic (M-CH2O-H•)+ or (M-CH2O-X •)+ ions.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0630
    Keywords: 05.45.+b ; 72.20.Ht ; 72.70.+m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We present experimental investigations on the spatio-temporal nonlinear current flow in the post-breakdown regime of p-germanium at liquid-helium temperatures. The basic nonlinear effects are characterized in terms of the underlying semiconductor physics, taking into account the influence of different experimental parameters.
    Type of Medium: Electronic Resource
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