Photochemistry — David Phillips / Serious Science

Chemist David Phillips on the electron spin, singlet states and the singlet oxygen.

Read the full text on our website: http://serious-science.org/photochemistry-10410

'So what are the fates of an excited singlet state to start with? It can drop back down to the state from which it started, the ground state, and it can give back out the light that it absorbed. But it always loses a little bit of energy, so the fluorescence is always at longer wavelengths than the light which is absorbed. That can be of great importance. That’s true in molecules; in atoms you get the same radiation frequency, you get the same wavelength of light in absorption as in emission. '

David Phillips, Professor of Natural Science, Department of Chemistry, Imperial College London Senior Research Investigator

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