A combination of resonant inelastic x-ray scattering and resonant Auger
spectroscopy provides complementary information on the dynamic response of
resonantly excited molecules. This is exemplified for CH3I, for which we
reconstruct the potential energy surface of the dissociative I 3d−2 double-
core-hole state and determine its lifetime. The proposed method holds a strong
potential for monitoring the hard x-ray induced electron and nuclear dynamic
response of core-excited molecules containing heavy elements, where ab initio
calculations of potential energy surfaces and lifetimes remain challenging
