S. Sundin et al., VIBRATIONALLY SELECTIVE RESONANT AUGER-SPECTROSCOPY OF THE 3P CORE-TO-RYDBERG-EXCITATION IN CO, Physical review. A, 56(1), 1997, pp. 480-487
The Auger decay of the C 1s-->3p excitation in CO has been studied by
means of vibrationally selective angle-resolved electron spectroscopy.
It is shown that for these highly excited Rydberg states the strict s
pectator model works excellently in describing the Auger decay. Conseq
uently, all the spectral features have been identified dy comparison t
o previous normal Auger studies. Intense lines belonging to 3p-->4p sh
akeup also accompany the main lines; together with the total absence o
f any participator contribution, this reveals the atomiclike nature of
the 3p Rydberg orbital. Remarkably large differences between the deca
y spectra recorded on the 3p(v' =0) and the 3p(v' =1) resonance reveal
the spatial differences in the decay paths. For transitions to the fi
nal state with the lowest binding energy in the spectator region, an a
ngular anisotropy dependent upon the vibrational quantum number of the
final state is observed. We observe different angular anisotropy for
transitions to different vibrational levels of the same electronic fin
al state in resonant Auger spectroscopy.