Abstract
The probability of the ${L}_{2}{L}_{3}V$ Coster-Kronig (CK) decay process in Ni following the creation of a ${2p}_{1/2}$ core hole has been measured by photoemission spectroscopy using synchrotron radiation. The branching ratio between CK and ${L}_{2}\mathrm{VV}$ Auger decay has been determined as a function of the photon energy in the proximity of the ${L}_{2}$ edge (870--890 eV). It is found to become independent upon the photon energy range already a few eV above threshold. The direct low-energy (about 7 eV) CK emission spectrum has also been observed.
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