Quenching effects and the afterglow of chlorophyll
| Autor: | W.C. Denison, H.O. Albrecht, C.E. Mandeville, L.G. Livingston |
|---|---|
| Rok vydání: | 1959 |
| Předmět: |
Quenching
Materials science biology Computer Networks and Communications business.industry Applied Mathematics Electron Photochemistry biology.organism_classification Fluorescence Afterglow chemistry.chemical_compound chemistry Control and Systems Engineering Chlorophyll Excited state Signal Processing Optoelectronics Chlorella pyrenoidosa Phosphorescence business |
| Zdroj: | Journal of the Franklin Institute. 268:278-282 |
| ISSN: | 0016-0032 |
| DOI: | 10.1016/0016-0032(59)90489-2 |
| Popis: | The weak light-emission of Chlorella pyrenoidosa about 4 seconds after illumination by photosynthesizing blue light shows an apparent partial quenching when radiation at λ7000 A is simultaneously applied. This result accords with the present view that this afterglow arises from the thermal release of electrons trapped in a crystalline structure of chlorophyll. The “quenching” radiation would provide optical release. Phosphorescence excited by longer wavelengths than blue is not quenched, suggesting it to arise by an essentially different mechanism. Chlorophylls and derivatives dissolved in a film of cellulose butyrate show a rather characteristic weak afterglow, often of several minutes half-life, of shorter wave-length than the fluorescence, and which is not certainly a light-induced oxidative chemiluminescence. |
| Databáze: | OpenAIRE |
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