OBSERVATION OF NONISOTROPIC AUGER ANGULAR-DISTRIBUTION IN THE C(1S) SHAPE RESONANCE OF CO

Angle-resolved high-resolution C(KVV) Auger spectra of CO were taken i n the vicinity of the C(1s) sigma shape resonance. These spectra show clear evidence for the theoretically predicted anisotropic K-shell Au ger emission in molecules. Complementary results from angle-resolved p hotoion spectroscopy show that the small size of the observed effect i s, besides the varying intrinsic anisotropy of the Auger decay, also d ue to a smaller anisotropy in the primary absorption process than orig inally predicted but in good agreement with more recent calculations. Contrary to this, satellite Auger transitions show unexpectedly large anisotropies.