Comparison of High‐Energy and Ultraviolet‐Radiation Induced Luminescence in Liquid Systems
| Autor: | Sanford Lipsky, Milton Burton |
|---|---|
| Rok vydání: | 1959 |
| Předmět: | |
| Zdroj: | The Journal of Chemical Physics. 31:1221-1226 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.1730572 |
| Popis: | Luminescence induced by Co60‐gamma excitation of some organic solvent‐solute pairs has been compared with 2537 A excitation as to dependence of intensity on solute concentration and on concentration of an added quencher. The solutions studied were 1,6‐diphenylhexatriene in benzene, p‐terphenyl in benzene, and p‐terphenyl in toluene. The quencher was bromobenzene. The energy‐transfer parameter Q of the Kallmann‐Furst theory and the quenching constant were obtained for each of the systems. Within an estimated experimental error of about 5%, Q was unaffected by change in source of excitation. The efficiency of quenching was found to be greater for Co60‐gamma than for uv excitation for the two systems involving p‐terphenyl. With diphenylhexatriene as solute, however, the quenching constant was unchanged. These results argue against a mechanism of energy exchange involving charge transfer. The high rates of transfer and quenching are consistent with a picture of the solvent involving the existence of small ordered regions within which exciton transfer can occur so that the entire region is viable to attack by a foreign molecule with resultant quenching or energy transfer. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|