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  • 1
    Electronic Resource
    Electronic Resource
    Excitation of an atom in a nonstationary cavity (2000)
    Springer
    JETP letters 72 (2000), S. 234-237 
    Details
    ISSN: 1090-6487
    Keywords: 31.30.Jv ; 32.80.−t
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effect of excitation of an atom in an initially photon-free nonstationary cavity is predicted. Two excitation mechanisms are considered, both different from the trivial absorption of photons created due to the nonstationary Casimir effect. The first one is based on the fact that the photon states appear simultaneously with atomic excitation if the characteristic time of cavity nonstationarity is of the same order as the atomic transition time. The second one is associated with the “shake-up” effect caused by the modulation of the atomic ground-state Lamb shift upon a fast change in the cavity parameters. The presence of an atom in the nonstationary cavity affects the photon creation process. In particular, it changes the average number of generated photons and removes the constraint (inherent in the nonstationary Casimir effect) that only an even number of photons can be created. In addition, a new mechanism of photon generation associated with the shake-up effect appears.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1324017
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  • 2
    Electronic Resource
    Electronic Resource
    Acid-catalyzed Conversions of N-(4-Nitrobenzylidene)-2-cyclopropyl- and N-(4-Nitrobenzylidene)-2-alkenylanilines. A new Method for the Synthesis of Dihydroquinolines and Quinolines (2000)
    Springer
    Chemistry of heterocyclic compounds 36 (2000), S. 1198-1205 
    Details
    ISSN: 1573-8353
    Keywords: alkenylazomethines ; benzylideneanilines ; dihydroquinolines ; N-(4-nitrobenzylidene)-2-alkenylaniline ; N-(4-nitrobenzylidene)-2-cyclopropylaniline ; phenylcyclopropanes ; quinolines ; cyclopropanes ; 2-cyclopropylanilines ; intramolecular rearrangements ; acid-catalyzed rearrangements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The acid-catalyzed conversions of N-(4-nitrobenzylidene)-2-cyclopropyl- and N-(4-nitrobenzylidene)-2-alkenylanilines have been studied. It has been established that the protonated azomethine unit of N-(4-nitrobenzylidene)-2-cyclopropylanilines is not capable of initiating intramolecular heterocyclization with participation of the three-membered ring. Conversion of N-(4-nitrobenzylidene)-2-(1-methylcyclopropyl)aniline to derivatives of quinoline is possible under the influence of concentrated H2SO4. Under the same conditions 2-methylcyclopropyl- and cyclopropyl-substituted Schiff's bases form only the corresponding alkenylazomethines (isomerization of the three-membered ring). Under the influence of more moderate acids (trifluoroacetic, polyphosphoric) N-(4-nitrobenzylidene)-2-propenyl- and N-(4-nitrobenzylidene)-2-buten-2-yl)anilines are converted to the corresponding dihydroquinolines and quinolines in high yields. N-(4-Nitrobenzylide! ne)- 2-(2,2-dimethylvinyl)aniline does not form derivatives of quinoline under the influence of the same acids in the given conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002824917758
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    Paper (German National Licenses)
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