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I've been reading about them and I'm struggling to completely understand. However, I do understand that a photosensitizer absorbs light (through its electrons?), making it excited. Then it's supposed to elicit a chemical reaction onto a substrate after which, the photosensitizer goes back to the ground state. How does it do that? Does it pass along the energy it got from the light? Do the excited electrons from the photosensitizer reacts with the substrate like a a catalyst?
I also read there are at least 2 types of photosensitization. Must oxygen be always present in the process?
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