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  • 1990-1994  (4)
  • 1985-1989
  • 1940-1944
  • 1993  (4)
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Erscheinungszeitraum
  • 1990-1994  (4)
  • 1985-1989
  • 1940-1944
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Femtosecond four wave mixing spectroscopy of conjugated polymers (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 1597-1606 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Time-resolved four wave mixing (4WM) signals of conjugated polymers are calculated using a density matrix approach and the Hartree–Fock approximation. The influence of the Coulomb interaction as well as size effects on the nonlinear optical response are examined. For the Hückel model (no Coulomb interaction), quantum beats due to the coherent excitation of several band states are found for small sizes, and photon echo-like behavior is obtained for infinite size. The Coulomb interaction changes the nature of the response and gives rise to a broad delayed signal whose temporal profile is determined by the dephasing time.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.465328
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  • 2
    Digitale Medien
    Digitale Medien
    PANTOPRAZOLE AND 24-HOUR INTRAGASTRIC ACIDITY (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Alimentary pharmacology & therapeutics 7 (1993), S. 0 
    Details
    ISSN: 1365-2036
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2036.1993.tb00077.x
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  • 3
    Digitale Medien
    Digitale Medien
    Chlorate and oxygen formation in alkali chloride membrane electrolysis (1993)
    Springer
    Journal of applied electrochemistry 23 (1993), S. 103-107 
    Details
    ISSN: 1572-8838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract During the operation of an industrial-scale membrane electrolysis plant over a number of years, a record was kept of the formation of the byproduct oxygen in the anode gas and chlorate in the anolyte parallel to the decline of the current efficiencies of the main products. It was found that the current efficiencies of the byproducts increase linearly with the declining current efficiencies of the main products, chlorine and caustic soda. Of the two types of anode used, one exhibited considerably more oxygen formation than the other. The high-oxygen anode was associated with distinctly lower chlorate formation than the low-oxygen anode. The increasing oxygen contents and chlorate formation rates associated with falling caustic current efficiency are reported for both types of anode. If hydrochloric acid is used to destroy the chlorate, the amount of acid must be increased as the caustic current efficiency falls. The amounts of hydrochloric acid required for the two types of anode are calculated as examples for 96% and 93% caustic current efficiency.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00246945
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  • 4
    Digitale Medien
    Digitale Medien
    Kinetics of photo-induced dissociation of Na clusters deposited on Mica (1993)
    Springer
    The European physical journal 28 (1993), S. 321-329 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 36.40. + d ; 32.80.Wr ; 33.80.Gj
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Na clusters bound to mica surfaces have been irradiated with pulsed and cw visible laser light. Kinetic energy and angular distributions of the Na atoms desorbing from the clusters have been determined using cw two-photon laser-induced fluorescence detection. In addition the dependence of the desorption rate on laser power, wavelength and polarization has been measured. The most probable kinetic energyE kin of the photodesorbed atoms at the surface temperatureT S =300 K was found to beE kin=18±5 meV, independent of laser irradiance (3 µJ/cm2...20 mJ/cm2) and wavelength (450 nm, 505 nm, 658 nm). With increasing orientation angle between detection axis and surface normal (0°≦Θ≦90°)E kin was observed to decrease slightly, while it was nearly independent of surface temperature betweenT S =30 K andT S =300 K. Also, with increasing radius of the Na clusters the desorbing Na atoms slowed down. The angular distribution of the Na atoms was of cos2-type with respect to the surface normal. These observations suggest that laser-induced desorption of Na from Na clusters bound to mica surfaces involves an initial rate-limiting step of direct surface plasmon excitation followed by a final step of delayed thermal desorption.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01437267
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