Optical spectrum of matrix-isolated Cu2

Abstract
The absorption spectrum of Cu2 isolated in Ne has been derived from a combined absorption and emission spectroscopic study over a photon energy range from 2 to 8 eV. It is demonstrated how emission yield spectroscopy can be used to discriminate the dimer absorption bands against those of the monomer. The Cu2 spectrum is discussed in the light of recent theoretical cluster calculations, and an energy level scheme for Cu2 is derived.