Adsorption of sodium and cesium on aggregates of C60

摘要: We explore the formation of C60 sodium and cesium complexes in superfluid helium nanodroplets. Anomalies mass spectra these doped droplets reveal anomalies stability of ions. (C60) m Cs+ n ions ( m ≤ 6) are particularly abundant if they contain n = 6m + 1 atoms; Cs2+ dications m ≤ 3 or 5) n + 2. These findings consistent with notion that alkali metal atoms (A) transfer their valence electrons into three-fold degenerate lowest unoccupied orbital C60, resulting stable C60A6 building blocks. However, 4CsCs2+ display an entirely different pattern; instead expected anomaly at 6 × 4 + 2 26 we observe a strong odd-even alternation starting = 6. Also surprising is effect adding one H2O CO2 molecule to Cs mono- dications; shift by two units as impurity were acting acceptor for from the atoms.