Abstract
The effective attenuation length (EAL) of low-energy electrons in CoO is investigated by photoemission spectroscopy experiments $(5\ensuremath{\le}h\ensuremath{\nu}\ensuremath{\le}19\phantom{\rule{0.3em}{0ex}}\mathrm{eV})$ by measuring the Ag Fermi-edge signal through a CoO overlayer of increasing thickness. The EAL is found to increase when lowering the electron energy, but the experimental values are much smaller than expected from the commonly used Seah--Dench formulas [Surf. Interface Anal. 1, 2 (1979)].
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