The optical spectra of matrixhyphen;isolated palladiumndash;nitrogen complexes: An investigation by absorption, emission, and photoelectron spectroscopy

摘要

The optical spectra of palladium in neon and argon matrices containing up to 100percnt; dinitrogen have been studied. Beside the known bands of isolated Pd atoms new strong bands assigned to weakly bonded Pd(N2)m(m=1, 2) complexes appear. The bands are attributed to three different types of transition. The dominant lines are essentially due to transitions localized at the Pd atom but strongly perturbed by a lsquo;lsquo;crystal fieldrsquo;rsquo; due to the weakly bonded N2molecules. Secondly, a vibrational progression at lower energies is assigned to a Pd to N2charge transfer transition and thirdly, at high energies, a vibrational progression assigned to a locally excited state of an N2molecule perturbed by weak bonding to Pd is observed. No evidence has been found for the presence of Pd(N2)3. Photoelectron spectra of the Pd(N2)mcomplexes in neon have been observed. The Pd 4dphotoemission peak is shifted with respect to the Pd atom in Ne by sim;1.1 eV to higher binding energies.