Chergui, Majed2014-12-302014-12-302014-12-30201410.1039/c4fd00157ehttps://infoscience.epfl.ch/handle/20.500.14299/109517WOS:000345529900001I discuss the recent developments concerning emerging ultrafast sources of short wavelength radiation, as well as the new methods they generate. I then dwell on a few examples of recent results and the way the new sources will bring major advancements in our understanding of fundamental chemical dynamics.text::journal::journal article::research article