Photophysical parameters for potential vapour-phase dye-laser media |
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| Authors: | R H Compton K T V Grattan T Morrow |
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| Institution: | (1) Department of Pure and Applied Physics, The Queen's University of Belfast, BT7 1NN Belfast, Noithern Ireland;(2) Present address: Optics Section, The Blackett Laboratory, Imperial College of Science and Technology, Prince Consort Road, SW7 2BZ London, England |
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| Abstract: | The fundamental photophysical parameters of the organic scintillators, anthracene, 9, 10 dimethyl antracene (DMA), 9, 10 diphenyl
anthracene (DPA), 2-(1-napthyl)-5-phenyloxazole (α-NPO) and 2, 2′-p-phenyl bis (5-phenyloxazole) (POPOP), were investigated
in the liquid and vapour phases. Their ground state, triplet-triplet and fluorescence spectra were determined and accurate
extinction coefficients obtained. Photodecomposition of POPOP vapour under 337 nm excitation was investigated in detail and
a photodecomposition quantum yield of 1.1×10−2 obtained at 568 K. The POPOP triplet state in the vapour phase is quenched by the addition of 1, 3, 5, 7 cyclo-octatetraene
and a quenching rate constant of 2.9×1010 M−1 s−1 was determined. |
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| Keywords: | 42 55 M 82 50 |
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