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  • Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter  (2)
  • 13C-NMR  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Transfer dynamics from an interface type-II heavy-hole exciton to a type-I light-hole exciton in a ZnSe/(Zn, Mn) Se heterostructure (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1567-1571 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter ; Photoluminescence ; II–VI compounds and other chalcogenides ; Conference proceedings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary Resonant photoluminescence and excitation spectroscopy and time-resolved photoluminescence are performed on a 50 Å thick ZnSe/(Zn, Mn) Se strained quantum well. From these experiments, the existence of a relaxation from a type-II heavy-hole bound interface exciton to a type-I light-hole exciton is demonstrated. The time transfer from the heavy-hole exciton to the light-hole exciton is found to be of the same order of magnitude as the recombination time of the heavy-hole exciton. This transfer is enhanced when temperature increases.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02457245
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Time-resolved photoluminescence and steady-state optical investigations of a Zn1−x Cd x Se/ZnSe quantum well (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1435-1440 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter ; Photoluminescence ; II–VI compounds and other chalcogenides ; Conference proceedings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary We report on time-integrated and time-resolved optical experiments performed on a 26 Å thick Zn0.85Cd0.15Se/ZnSe quantum well, for temperatures in the 10–200 K range. Excitation spectroscoy allows an estimation of the relative valence band offset, which is found to be 10%. From the temperature variation of the decay time of the photoluminescence performed reasonantly on the e1h1 excitonic transition, we deduce that the main non-radiative mechanism is the heavy-hole thermal escape out of the well.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02457223
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    In vivo 13C chemical shift imaging of the human liver (1994)
    Springer
    Magnetic resonance materials in physics, biology and medicine 2 (1994), S. 425-428 
    Details
    ISSN: 1352-8661
    Schlagwort(e): in vivo spectroscopic imaging ; human liver ; 13C-NMR
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin , Physik
    Notizen: Abstract Chemical shift imaging (CSI) was applied to measure natural abundance proton-decoupled13C-NMR spectra of the human liver. Large surface coils were designed for13C spectra acquisition (16-cm-diameter circular coil) as well as for proton imaging and decoupling (21×20-cm butterfly coil). Such sizes allowed deep observations of the abdomen. A space matrix of 8×4 voxels (4×8 cm each) was defined using 32 phase-encoding steps. Magnetic field gradients were adjusted on multicompartment phantoms to limit contamination between voxels. Spectral maps containing {1H}-13C spectra of liver from healthy volunteers with an acceptable signal-to-noise ratio were recorded within 20 min. Liver spectra exhibited well-defined resonances corresponding to fatty acyl chains, carbonyl groups, and sugars. The (C-l)-glycogen resonance was also detected under such conditions. Such a technique would be of interest in the development of metabolic investigations on the human liverin vivo.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01705289
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