T e (t) is the electronic temperature that is calculated within the two temperature model (2TM). In the 2TM, we use the same material parameters for a Ru surface as in ref 17. Fluence 60 J/m², electronic temperature Fluence 60 J/m², phonon temperature Fluence 50 J/m², electronic temperature Fluence 50 J/m², phonon temperature Even though the 2TM provides both electronic and phonon temperatures, T e (t) and T p (t), here we use only the electronic temperature. Ruthenium atoms are fixed as in ref 17.