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  • 1
    Electronic Resource
    Electronic Resource
    Effects of the overlap between wave functions of impurity centers on the activation energy of hopping conduction (2000)
    Springer
    JETP letters 71 (2000), S. 17-20 
    Details
    ISSN: 1090-6487
    Keywords: 72.20.E ; 72.80.Jc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hopping conductivity σ3 has been studied in samples of slightly counterdoped crystalline Si: B with a boron concentration of 2×1016 cm−3〈N〈1017 cm−3 and a compensation of 10−4≤K≤10−2. It is found that at K≤10−3 the activation energy ε3 is not lower (as it must be according to classical notions at finite K) but larger than the value εN=e 2 N 1/3/κ, where e is the electronic charge and κ is the dielectric constant. With decreasing N, the energy ε3 drops slower and, with decreasing K, grows faster than follows from the standard theory. At K≤10−4, ε3 is higher than ε N by a factor of 1.5–2. The result is explained by the effect of the overlap between wave functions of neighboring impurity centers on the structure of the impurity band.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568267
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  • 2
    Electronic Resource
    Electronic Resource
    Phenazinee di-N-oxide radical cation and its reactions with hydrocarbons (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 1889-1895 
    Details
    ISSN: 1573-9171
    Keywords: phenazine di-N-oxide ; radical cation ; hydrocarbons ; oxidation ; mechanism ; O2 effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The absorption spectra of phenazine di-N-oxide radical cation (OPO+·) in dichloromethane were recorded by the spectroelectrochemical method in the range from 300 to 700 nm. The reactions of the electrochemically generated OPO+· withpara-substituted toluenes, ethylbenzene, and cumene were studied. Using differential cyclic voltammetry, relative rate constants of reactions of OPO+· with substrates were determined; their correlations with σ+ para constants of substituents gives p = -2.7, which attests to the nonradical character of the reaction of OPO+· with RH. This conclusion is confirmed by the study of the effect of O2 on oxidation of ethylbenzene and cumene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01457770
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  • 3
    Electronic Resource
    Electronic Resource
    Formation and redox properties of a complex of phenazine di-N-oxide with a proton (1992)
    Springer
    Russian chemical bulletin 41 (1992), S. 655-659 
    Details
    ISSN: 1573-9171
    Keywords: phenazine-di-N-oxide ; cation-radical ; protonation ; ethylbenzene ; oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The electrochemical properties of phenazine di-N-oxide (OPO) in acetonitrile solutions in the presence of acids were studied by the method of cyclic voltammetry (CVA). It was shown that OPO forms with a proton a complex having a 2:1 composition, its oxidation and reduction potentials being equal to 1.57 and ∼0.35 V (saturated calomel electrode), respectively. The same protonated form is also formed in the reaction of OPO+. with organic substrates, in particular with hydrocarbons and alcohols. The reaction mechanism includes a complexation of OPO+. with the substrate, followed by splitting off of a hydrogen from the complex by another OPO+· cation-radical or a proton by the initial OPO. A rapid selective deoxygenation of the protonated form of OPO by iodide ion in acetonitrile in an acid medium has been discovered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01150886
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