| Issue |
Europhys. Lett.
Volume 49, Number 5, March I 2000
|
|
|---|---|---|
| Page(s) | 631 - 636 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00197-2 | |
| Published online | 01 September 2002 | |
Enhanced thermal dissociation of optically excited 
chains
1
Department of Experimental Physics, Umeå University - S-901 87 Umeå,
Sweden
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
Received:
20
October
1999
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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