Sunset photochemistry of ClO and BrO in the arctic polar vortex from in-situ measurements during HALOMAX, in stratospheric ozone - Stroh, F.; Woyke, T.; Vogel, B.; Grooss, J. U.; Müller, R.; Müller, M.; Engel, A.; Stowasser, M.; Oelhaf, H. (2003)