Time-resolved diffraction: general discussion. (13th May 2021) - Allum, Felix; Amini, Kasra; Ashfold, Michael; Bansal, Dipanshu; Berger, Raphael J. F.; Centurion, Martin; Dixit, Gopal; Durham, Daniel; Fasshauer, Elke; Figueira Nunes, Joao Pedro; Fischer, Ingo; Grell, Gilbert; et al.