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  • 1
    Electronic Resource
    Electronic Resource
    Direct measurements of nonlinear absorption and refraction in solutions of phthalocyanines (1992)
    Springer
    Applied physics 54 (1992), S. 46-51 
    Details
    ISSN: 1432-0649
    Keywords: 33.00 ; 42.65 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report direct measurements of the excited singlet state absorption cross section and the associated nonlinear refractive cross section using picosecond pulses at 532 nm in solutions of phthalocyanine and naphthalocyanine dyes. By monitoring the transmittance and far field spatial beam distortion for different pulsewidths in the picosecond regime, we determine that both the nonlinear absorption and refraction are fluence (energy per unit area) rather than irradiance dependent. Thus, excited state absorption (ESA) is the dominant nonlinear absorption process, and the observed nonlinear refraction is also due to real population excitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331733
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Pulsed radiolysis of model aromatic polymers and epoxy based matrix materials (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Models of primary processes leading to deactivation of energy deposited by a pulse of high energy electrons were derived for epoxy matrix materials and polyl-vinyl naphthalene. The basic conclusion is that recombination of initially formed charged states is complete within 1 nanosecond, and subsequent degradation chemistry is controlled by the reactivity of these excited states. Excited states in both systems form complexes with ground state molecules. These excimers or exciplexes have their characteristics emissive and absorptive properties and may decay to form separated pairs of ground state molecules, cross over to the triplet manifold or emit fluorescence. ESR studies and chemical analyses subsequent to pulse radiolysis were performed in order to estimate bond cleavage probabilities and net reaction rates. The energy deactivation models which were proposed to interpret these data have led to the development of radiation stabilization criteria for these systems.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: NASA. Langley Research Center Large Space Systems Technol., 1981; p 59-65
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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