Theoretical study of the electron affinities of Cu, Cu2, and Cu3

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Abstract
Modified coupled pair functional (MCPF) calculations are shown to yield the electron affinities of Cu, Cu2, and Cu3 to nearly equal accuracy. The structural results for Cu−3, together with the experimental negative ion photoelectron results, show conclusively that Cu−3 is linear in its (1Σ+g) ground state. The weak feature in the Cu−3 photoelectron spectrum at an electron binding energy of 1.5 eV is due to ionization from the 3A’2 (equilateral triangle) excited state of Cu−3.