Structural evolution in (CO2)n clusters (n<103) as studied by mass spectrometry
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文摘
The mass distributions of (CO2)n− produced by electron-impact ionization of a free jet have been measured up to n
103. Several intensity anomalies observed in a small size range are ascribed to the stabilities of the negative ions. In contrast, a series of humps are clearly discernible in the range of n≥100, which reflects the abundance of neutral (CO2)n. The intensity oscillations are analyzed in the context of ‘geometrical shell closings’. The analysis reveals that the (CO2)n clusters with n
80 have truncated forms of an fcc crystal, most likely a cuboctahedral motif.
103. Several intensity anomalies observed in a small size range are ascribed to the stabilities of the negative ions. In contrast, a series of humps are clearly discernible in the range of n≥100, which reflects the abundance of neutral (CO2)n. The intensity oscillations are analyzed in the context of ‘geometrical shell closings’. The analysis reveals that the (CO2)n clusters with n80 have truncated forms of an fcc crystal, most likely a cuboctahedral motif.