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  • 2000-2004  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 597-599 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the three-dimensional imaging of the vibrational, solvent, orientational, and electronic relaxation in organic fluorescent samples at 200–500 nm spatial resolution. This is achieved in steady-state recordings by exciting the fluorophore with a femtosecond pulse and subsequent quenching with a time-delayed, redshifted femtosecond pulse through stimulated emission. Temporal resolution of 380 fs is solely determined by the pulse widths and is further reducible. Images of submicron structures revealing vibrational and solvent relaxation gradients are shown. Furthermore, we introduce contrast modes based on stimulated emission depletion and apply them to cellular imaging. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Pure and gallium doped YCrO3 and GdCrO3 with the formula (Y,Gd)1-xCr0.8Ga0.2O3 (x=0,...,0.2), prepared by a conventional oxide method, were investigated regarding the influence of A-cation-deficiency on structure, conductivity and electrode behaviour in a special modified galvanic cell for the determination of gaseous hydrocarbons (HC). All samples form the GdFeO3-type orthorhombic perovskite structure but with A-site-substoichiometry a second phase, (Y,Gd)3Ga5O12, with garnet structure occurs. All investigated chromites are semiconductors. The total conductivity in air is influenced by the second phase. The use of these samples as electrode materials does not show a HC sensitive behaviour.
    Type of Medium: Electronic Resource
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