Photophysical properties of gatifloxacin in aqueous solution by laser flash photolysis and pulse radiolysis

► Both the aborption and emission properties of GFX were pH-dependent. ► Triplet and cation radical properties were determined by laser flash photolysis. ► GFX undergoes monophotonic photoionization with a quantum yield of 0.16. ► Pulse radiolysis showed it can oxidize ammoacids such as tryptophan.