Question

difference between oxygen radical and singlet oxygen in photodegradation

Answer 1

oxygen radical:Reactive oxygen species are chemically reactive chemical species containing oxygen. Examples include peroxides, superoxide, hydroxyl radical,
singlet oxygen, and alpha-oxygen.
Singlet oxygen, systematically named dioxygen and dioxidene, is a gaseous inorganic chemical with the formula O=O, which is in a quantum state where all electrons are spin paired.