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Responses of Phycomyces indicating optical excitation of the lowest triplet state of riboflavin

Delbrück, Max and Katzir, Abraham and Presti, David (1976) Responses of Phycomyces indicating optical excitation of the lowest triplet state of riboflavin. Proceedings of the National Academy of Sciences of the United States of America, 73 (6). pp. 1969-1973. ISSN 0027-8424.

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Phototropic and light growth responses of the sporangiophore of Phycomyces have been elicited using tunable laser stimulation from 575 to 630 nm. The growth response shows additional components of the action spectrum with a sharp peak at 595 nm, a sharp cut-off at 585 nm, and a tail extending beyond 630 nm. The integral over the electronic transition (f-value) is 1.5 x 10^-9 times that at 455 nm. These parameters indicate a direct transition from the ground state to the lowest triplet state of riboflavin.

Item Type:Article
Additional Information:© 1976 by the National Academy of Sciences. Contributed by Max Delbrück, March 15, 1976. The experiments were performed in the laboratory of Prof. A. Yariv of the Electrical Engineering Department of the California Institute of Technology. The authors wish to express their appreciation to Professor Yariv for putting the laser facilities at their disposal, and to Messrs P. Agmon, D. Armstrong, and H.W. Yen for indefatigable help with laser troubleshooting. The work was supported by National Science Foundation Grant no. BMS 75-11316.
Subject Keywords:tunable laser; action spectrum
Record Number:CaltechAUTHORS:DELpnas76
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10477
Deposited By: Tony Diaz
Deposited On:09 May 2008
Last Modified:14 Nov 2014 19:20

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