The coupling of electronic and nuclei motion underpins chemical reactivity, with changing electron distributions driving and allowing for nuclei to rearrange. It is increasingly desirable to be able to experimentally observe and accurately simulate the structures of evolving chemical systems. We are therefore interested in developing novel experimental methodologies and simulation methods for probing the electronic and nuclei motion within complex systems. Here we will introduce some of our resent work on momentum based spectroscopies that allow us to investigate the electronic structure [1] and nuclei motion [2] within molecular and condensed mater systems.