Volume 49, Number 5, March I 2000
|Page(s)||631 - 636|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Enhanced thermal dissociation of optically excited chains
Department of Experimental Physics, Umeå University - S-901 87 Umeå,
2 Department of Applied Physics and Electronics, Umeå University S-901 87 Umeå, Sweden
3 Department of Experimental Physics, Chalmers University of Technology S-412 96 Göteborg, Sweden
4 Department of Physics and Measurement Technology (IFM), Linköping University S-581 83 Linköping, Sweden
Accepted: 16 December 1999
The thermal dissociation of polymers has been studied using Raman scattering. The measured dissociation rate depends on the intensity of the 1064 nm NIR excitation, showing that i) the band gap is smaller than 1.17 eV and ii) a radiation-enhanced thermal breakdown path exists in addition to the “normal” thermal breakdown mechanism. Quantum chemical calculations show that the energy barrier for thermal breakdown is about 40% lower in the first (optically) excited state than in the ground state. This agrees well with the ratio between our radiation-enhanced value and values near 1.9 eV measured by purely thermal methods.
PACS: 71.20.Tx – Fullerenes and related materials; intercalation compounds / 61.48.+c – Fullerenes and fullerene-related materials / 78.30.Na – Fullerenes and related materials
© EDP Sciences, 2000
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