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Coherence in electronically excited dimers. The observation of coherent dimers and its relationship to coherent excitons

Zewail, A. H. and Harris, C. B. (1974) Coherence in electronically excited dimers. The observation of coherent dimers and its relationship to coherent excitons. Chemical Physics Letters, 28 (1). pp. 8-14. ISSN 0009-2614. https://resolver.caltech.edu/CaltechAUTHORS:20160928-081726647

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Abstract

The coherent nature of molecular excited dimers in their triplet states is unequivocally established by a series of low temperature optically detected magnetic resonance experiments in zero field. The results clearly establish that a minimum coherence time for the dimer ψ(+) state in 1,2,4,5-tetrachlorobenzene (≈ 1.7 K) is longer than 5 × 10^(−7) s while the exchange time in these systems is approximately 16 × 10^(−12) s. This implies that the coherence persists for a time approximately 10^5 times that associated with the stochastic limit. The coherence time could, however, be even longer. Moreover, these new results clearly demonstrate that there is a direct and quantitative relationship between coherent properties of dimers and the coherent properties of triplet Frenkel excitons.


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http://dx.doi.org/10.1016/0009-2614(74)80003-5DOIArticle
http://www.sciencedirect.com/science/article/pii/0009261474800035PublisherArticle
Additional Information:© 1974Elsevier B.V. Received 9 May 1974. This work was supported in part by a grant from the National Science Foundation and in part by the Inorganic Materials Research Division of the Lawrence Berkeley Laboratory under the auspices of the U.S. Atomic Energy Commission.
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Issue or Number:1
Record Number:CaltechAUTHORS:20160928-081726647
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160928-081726647
Official Citation:A.H. Zewail, C.B. Harris, Coherence in electronically excited dimers. The observation of coherent dimers and its relationship to coherent excitons, Chemical Physics Letters, Volume 28, Issue 1, 1 September 1974, Pages 8-14, ISSN 0009-2614, http://dx.doi.org/10.1016/0009-2614(74)80003-5. (http://www.sciencedirect.com/science/article/pii/0009261474800035)
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ID Code:70629
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:29 Sep 2016 20:30
Last Modified:03 Oct 2019 15:59

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