  Low-energy electrons (LEEs) are known to be effective in causing strand
breaks in DNA. Recent experiments show that an important direct source of LEEs
is the intermolecular Coulombic decay (ICD) process. Here we propose a new
cascade mechanism initiated by core excitation and terminated by ICD and
demonstrate its properties. Explicit calculations show that the energies of the
emitted ICD-electrons can be controlled by selecting the initial atomic
excitation. The properties of the cascade may have interesting applications in
the fields of electron spectroscopy and radiation damage. Initiating such a
cascade by resonant X-ray absorption from a high-Z element embedded in a
cancerous cell nucleus, ICD will deliver genotoxic particles \textit{locally}
at the absorption site, increasing in that way the controllability of the
induced damage.
