  X-ray photoelectron spectroscopy (XPS) and KLL Auger spectra of aqueous KCl
solution were measured for the K$^+$ and Cl$^-$ edges. While the XPS spectra of
potassium and chloride have similar structures, both exhibiting only weak
satellite structures near the main line, the Auger spectra of these
isoelectronic ions differ dramatically. A very strong satellite peak was found
in the K$^+$ KLL Auger spectrum at the low kinetic energy side of the $^1$D
state. Using equivalent core models and ab initio calculations this spectral
structure was assigned to electron transfer processes from solvent water
molecules to the solvated K$^+$ cation. Contrary to the potassium case, no
extra peak was found in the KLL Auger spectrum of solvated Cl$^-$ indicating on
a strong dependence of the underlying processes on ionic charge. The observed
charge transfer processes are suggested to play an important role in charge
redistribution following single and multiple core-hole creation in atomic and
molecular systems placed into an environment.
