Luminescence of mass-selected CuAg in argon matrices

We report on an observation of the luminescence spectrum of mass-selected CuAg in an argon matrix. Although no Raman spectrum is obtained, an emission progression up to ν″=5 is observed, corresponding to the A0+–X1Σ+ transition observed in the gas phase. The origin of the transition is determined to be 20 262 (10) cm−1. We obtain a value of ωe″=223.8(4.9) cm−1, which is consistent with the gas-phase observations.