FLASH Mechanisms Track (Oral Presentations) ULTRAFAST TRACKING OF OXYGEN DYNAMICS DURING PROTON FLASH. (February 2022) - El Khatib, M.; Van Slyke, A.; Velalopoulou, A.; Shoniyozov, K.; Diffenderfer, E.; Kim, M.; Karagounis, I.; Busch, T.; Wiersma, R.; Koch, C.; Vinogradov, S.