The coexistence of two types of anion sates in nanometer-scale polyacene cluster anions, was analyzed. Nanoclusters of naphthalene and anthracene having single excess electron were synthesized in the gas-phase. The photoelectron spectra of size-selected cluster anions containing 2 to 100 molecules exhibited rigid 'crystal-like' cluster anion in which surrounding neutral molecules reorganize around the charge core. The results show that two anion states appear to correlate to negative polaronic states formed in corresponding crystals.
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