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Luminescence from trans-Polyacetylene Degraded by Laser Irradiation

  • K. Iwahana
  • P. Knoll
  • H. Kuzmany
  • M. Riegler
  • B. Hubmann
Conference paper
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 63)

Abstract

Very recently we have experimentally investigated an effect on trans-(CH)x of irradiation with intense laser light of more than 120 mW [1,2]. It was found that: (1) An initial effect of irradiation with intense laser light is the remarkable changes of the Raman line shapes of the C-C and C=C stretching modes,which are always accompanied by the increment of the background intensity. (2) Upon further irradiation,the background intensity enhances drastically and finally saturates at high-intensity levels. The change of the background intensity under irradiation can be described in terms of (i) an initial slow exponential increase with a time-constant 1/γ1, (ii) a fast exponential increase after a characteristic time tc, and (iii) saturation. (3) The quantity γ1.t (~0.54) is almost independent of the experimental conditions and samples used. (4) The new luminescence in stage (iii), consists of the several bands with the peak-energy spacing of 1200 ~1400 cm−1 and exhibits the unusual exciting-energy dependence that each band shifts with the laser frequency like a first-order Raman spectrum (see Fig.1). (5) The luminescence band is quite sensitive to exposure to air or oxygen,resulting in a disappearance of the band structure, i.e.., a single-peaked luminescence band which is less dependent upon the exciting-energy.

Keywords

Laser Frequency Luminescence Band Background Intensity Streak Camera Exciting Energy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    K. Iwahana, P. Knoll and H. Kuzmany, Mol. Cryst. Liq. Cryst. to be publishedGoogle Scholar
  2. 2.
    K. Iwahana, P. Knoll and H. Kuzmany: Phys. stat. sol. (b) 128, 162 (1985)Google Scholar
  3. 3.
    K.D. Rockwitz and H. Bässler: Chem. Phys. 70, 307 (1982)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1985

Authors and Affiliations

  • K. Iwahana
    • 1
  • P. Knoll
    • 1
  • H. Kuzmany
    • 1
  • M. Riegler
    • 2
  • B. Hubmann
    • 2
  1. 1.Institut für Festkörperphysik and Ludwig Boltzmann InstituteUniversity of WienWienAustria
  2. 2.University of GrazA-GrazAustria

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