Photoelectron spectroscopy of (CO2)n revisited: core switching in the 2 ⩽ n ⩽ 16 range

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Abstract

Photoelectron spectra of (CO2)n have been measured a photon energy of 4.66 eV, and the vertical detachment energy (VDE) determined as a function of the cluster size, 2 ⩽ n ⩽ 16. The n-dependence of the VDE shows sharp discontinuities between n = 6 and 7, and between n = 13 and 14, indicating that CO2 and C2O4 are formed as the core anions in (CO2)7 and (CO2)14 and vice versa when ‘core switching’ results from the formation of geometrically favored structures.

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