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Enhanced thermal dissociation of optically excited C60 chains.
Umeå University, Faculty of Science and Technology, Physics. Umeå University, Faculty of Science and Technology, Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
2000 (English)In: Europhysics letters, ISSN 0295-5075, Vol. 49, no 5, 631-636 p.Article in journal (Refereed) Published
Abstract [en]

The thermal dissociation of C60 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 Ea 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 $E_{a} = (1.1 \pm 0.02)\,eV$ and values near 1.9 eV measured by purely thermal methods.

Place, publisher, year, edition, pages
EDP Sciences , 2000. Vol. 49, no 5, 631-636 p.
Keyword [en]
Fullerenes, C60, polymers, thermal dissociation, optical excitation, polymer dissocation, molecular chains, orthorhombic polymer, fullerene polymer, quantum chemical calculations
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-22607DOI: 10.1209/epl/i2000-00197-2OAI: oai:DiVA.org:umu-22607DiVA: diva2:217338
Available from: 2009-05-14 Created: 2009-05-14 Last updated: 2010-01-22

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Persson, Per-AxelSundqvist, Bertil

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