Optical spectra of matrix-isolated palladium atoms

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Abstract
The optical properties of Pd atoms isolated in Ne, Ar, Kr, and Xe have been studied in the photon energy range of 2–10 eV by absorption, emission, and emission-yield spectroscopy. Strong matrix effects on the optical transitions are observed which lead to a breakdown of the selection rules and, hence, make a band assignment by AMCOR (atom to matrix correlation) impossible. The unusually large blue shift of the Pd 4d→5p transitions is rationalized by an interstitial site for the Pd atom in all four noble gas matrices. Such a site assignment is supported by the high mobility of the Pd atoms which becomes apparent in annealing experiments. For Pd in Ne, absorption bands due to 4d→4f transitions were found around 8 eV. Finally, a transient-absorption spectrum from a metastable state has been observed, which is in agreement with previously reported MCD measurements.