Shelby, R. M. and Zewail, A. H. and Harris, C. B. (1976) Coherent energy migration in solids: Determination of the average coherence length in one‐dimensional systems using tunable dye lasers. Journal of Chemical Physics, 64 (8). pp. 3192-3203. ISSN 0021-9606 http://resolver.caltech.edu/CaltechAUTHORS:20120810-083147167
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The coherent nature of energy propagation in solids at low temperatures was established from the time resolved response of the crystal to short optical pulses obtained from a dye laser (pumped by a nitrogen gas laser). The trapping and detrapping of the energy by shallow defects (x traps) was evident in the spectra and enabled us to extract the coherence length: l≳700 Å=186 molecules for the one‐dimensional triplet excitons of 1,2,4,5‐tetrachlorobenzene crystals at T<4.2° K. This length which clearly exceeds the stochastic random walk limit is related to the thermalization mechanisms in this coupled exciton–trap system, and its magnitude supports the notion that exciton–phonon coupling is responsible for the loss of coherence on very long molecular chains (trap concentration is 1/256 000).
|Additional Information:||© 1976 American Institute of Physics. Received 29 September 1975. Online Publication Date: 28 August 2008. This research has been supported in part by the National Science Foundation, a departmental National Science Foundation equipment grant, and in part by the Materials and Molecular Research Division of the Lawrence Berkeley Laboratory under the auspices of the U. S. Energy Research and Development Administration.|
|Classification Code:||PACS: 78.55.-m, 71.35.-y|
|Official Citation:||Coherent energy migration in solids: Determination of the average coherence length in one‐dimensional systems using tunable dye lasers R. M. Shelby, A. H. Zewail, and C. B. Harris J. Chem. Phys. 64, 3192 (1976); http://dx.doi.org/10.1063/1.432657|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||10 Aug 2012 15:57|
|Last Modified:||26 Dec 2012 15:56|
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