Peon, Jorge and Zewail, Ahmed H. (2001) DNA/RNA nucleotides and nucleosides: direct measurement of excited-state lifetimes by femtosecond fluorescence up-conversion. Chemical Physics Letters, 348 (3-4). pp. 255-262. ISSN 0009-2614. https://resolver.caltech.edu/CaltechAUTHORS:20160818-103816734
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Abstract
Fluorescence decay times of the nucleosides: adenosine, guanosine, cytidine and thymidine, and of the corresponding nucleotides, were determined using the technique of fluorescence up-conversion with femtosecond time resolution. The excited-state lifetimes of these nucleic acid molecules all fall in the sub-picosecond time scale, confirming the presence of an ultrafast internal conversion channel for both the nucleotides and the nucleosides; the nucleotides lifetimes are longer than those of the nucleosides by up to 20%. The ultrafast internal conversion is biologically relevant to the stability of DNA, and our results support the sub-picosecond repopulation of the ground state, consistent with transient absorption studies on the femtosecond time scale.
| Item Type: | Article | |||||||||
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| Additional Information: | © 2001 Elsevier B.V. Received 20 August 2001, Available online 17 October 2001. This work was supported by a grant from the National Science Foundation. We wish to thank Dr. Dongping Zhong for his help with the initial setup of the experiments. | |||||||||
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| Issue or Number: | 3-4 | |||||||||
| Record Number: | CaltechAUTHORS:20160818-103816734 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20160818-103816734 | |||||||||
| Official Citation: | Jorge Peon, Ahmed H Zewail, DNA/RNA nucleotides and nucleosides: direct measurement of excited-state lifetimes by femtosecond fluorescence up-conversion, Chemical Physics Letters, Volume 348, Issues 3–4, 9 November 2001, Pages 255-262, ISSN 0009-2614, http://dx.doi.org/10.1016/S0009-2614(01)01128-9. (http://www.sciencedirect.com/science/article/pii/S0009261401011289) | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 69757 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Ruth Sustaita | |||||||||
| Deposited On: | 18 Aug 2016 19:03 | |||||||||
| Last Modified: | 03 Oct 2019 10:25 |
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