Theoretical Identification of the Smallest Fullerene,C20

Abstract
By using first-principles calculations, we calculate the vibronic fine structure in photoelectron spectra of C20 clusters. Based on our results, we assign one of the recently observed spectra [H. Prinzbach et al., Nature (London) 407, 60 (2000)] to the fullerene structure and, therefore, confirm the experimental claim that the smallest fullerene is really synthesized.