Abstract
Comparison of the absorption spectra for matrix-isolated Ni atoms with gas-phase data reveals that the electronic ground-state configuration of the isolated atom can be changed by the matrix. While Ni in Ne has the same configuration as in the gas phase, namely 3d 84s 2 we find in Ar, Kr, and Xe the 3d 94s 1 configuration to be the ground state. The matrix-induced changes is explained by the repulsive matrix-dopant interaction, which is sufficiently lowered in the 3d 94s 1 configuration to overcompensate for the energy difference of 205 cm −1 by which the 3d 94s 1 level lies above the 3d 84s 2 in the free atom.
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