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O 1s --> sigma* resonance in O2: inadequacy of only two exchange-split components
M N Piancastelli1, A Kivimäki, V Carravetta
1Department of Chemical Sciences and Technologies and INFM, University Tor Vergata, 00133 Rome, Italy.
Abstract:
The O 1s-->sigma* transition below the O K-edge in O2 has been investigated by absorption, constant ionic state (CIS) experiments, and extensive configuration interaction calculations. CIS scans of the three lowest-lying final states reached in resonant Auger decay provide a wealth of information on energy range, symmetry, and spin multiplicity of the intermediate states with sigma* character. We conclude that the identification of only two exchange-split components is inadequate because a complex manifold of states with sigma* character exists with no unique energy difference between related states.