Abstract
We report calculated cross sections for the electronic excitation of
carbon monoxide by positron impact. The calculations were carried out
with the Schwinger multichannel method and included six collision
channels, namely the ground (X (1)Sigma(+)) and five electronically
excited (A (1)Pi, I (1)Sigma(-) and D (1)Delta) states. Present
calculated excitation cross sections to the A (1)Pi state did not
present any resonant features, being in this sense consistent with
previous calculations for the isoelectronic nitrogen molecule. The
experimental a (1)Pi(g) excitation cross section of N-2 presented a
resonantlike structure which would also be expected in the A (1)Pi
excitation of CO. We discuss possible reasons for the disagreement
between experiment and theory.
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