Accession Number : ADA136339

Title :   Photodegradation of Coumarin Laser Dyes. An Unexpected Singlet Self-Quenching Mechanism.

Descriptive Note : Technical rept. 1 Jan-31 Oct 82,

Corporate Author : BOSTON UNIV MA DEPT OF CHEMISTRY

Personal Author(s) : Jones,G , II ; Bergmark,W R

PDF Url : ADA136339

Report Date : 31 Oct 1983

Pagination or Media Count : 12

Abstract : Photolysis of aminocoumarine laser dyes, including 7-diethylamino-4-methyl-coumarin has been investigated. Dealkylation of groups at the 7-dialkylamino functionality, reduction of the lactone moiety and overall photodecomposition of dyes have been observed. Concentration quenching of dye fluorescence is important at concentrations above 0.01 M. The photolysis is ascribed to singlet self quenching; triplet states are formed in low yield (flash photolysis) and are not reactive. (Author)

Descriptors :   *Photolysis, *Dyes, *Coumarins, *Lasers, Ethyl radicals, Methyl radicals, Alkyl radicals, Photodegradation, Reduction(Chemistry), Lactones, Photodecomposition, Quenching, Fluorescence, Electronic states, Concentration(Composition), Decay

Subject Categories : Radiation and Nuclear Chemistry
      Lasers and Masers
      Coatings, Colorants and Finishes

Distribution Statement : APPROVED FOR PUBLIC RELEASE