title: Preface to the Special Edition on Femtochemistry and "The Hamburg Conference on Femtochemistry 2015 (FEMTO12)".
authors.affiliation: Center for Free-Electron Laser Science , DESY, Notkestrasse 85, 22607 Hamburg, Germany.
authors.forename: Terry
authors.initials: T
authors.lastname: Mullins
authors.forename: Jochen
authors.initials: J
authors.lastname: Küpper