Low-energy electron-induced processes in fluorinated copper phthalocyanine films observed by [F.sup.-] desorption: why so little damage?

The desorption of [F.sup.-] ions from FCuPc films is used for monitoring damaging processes and accessing their nature under low-energy electron irradiation. The strong influence of energy redistribution is emphasized, which has quenched the long-lived negative ion resonances and has selected localized and strongly repulsive excitations.