Abstract
Angle-resolved high-resolution C(KVV) Auger spectra of CO were taken in the vicinity of the C(1s) ${\mathrm{\ensuremath{\sigma}}}^{\mathrm{*}}$ shape resonance. These spectra show clear evidence for the theoretically predicted anisotropic K-shell Auger emission in molecules. Complementary results from angle-resolved photoion spectroscopy show that the small size of the observed effect is, besides the varying intrinsic anisotropy of the Auger decay, also due to a smaller anisotropy in the primary absorption process than originally predicted but in good agreement with more recent calculations. Contrary to this, satellite Auger transitions show unexpectedly large anisotropies.
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