Dynamics of ultrafast dissociation of hydrogenic molecules by resonant antibonding core electron excitation: Conclusions from detuning dependence of H+- kinetic energy distributions from condensed films

► Dynamics of ultrafast bond breaking by resonant inner shell excitation. ► Detuning dependent fragment energy distributions. ► Different behavior of average and most probable kinetic energy. ► Signatures of bond evolution during core excited and post-decay states discernible.