Abstract
Core-electron excitations have attractive potential to induce site-selective chemical bond breaking of molecules. Compared to delocalized valence excitations, core excitations take place within a small region because of their spatial localization and atomic selectivity. Therefore, a specific atom in a molecule can be selectively excited. The core-excited states are quite unstable with an extremely high energy, so consecutive Auger decay processes resulting in ionic dissociation can occur in the vicinity of the excited atom. Site-selective bond breaking is considered to be promoted by dynamic synergy effects in both core-excited and Auger final states. From this concept, site-selective bond breaking-induced resonant core-excitations have been widely and successfully investigated in various molecular systems. In this article, site-selective nature of core excitations is outlined based on the observation for ester compounds on surfaces: –COO–CH3 ionic breaking induced by the corresponding σ*(COO–CH3)←C1s, O1s(OCH3) resonant excitations and –CO–OCH3 breaking by the σ*(CO–OCH3)←O1s(OCH3) excitation.
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