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We present distorted-wave cross sections for excitation of the A 'TI, a k, a' '2+, D 'A and d 3A states of CO by electrons in the 20 to 50 eV energy range. In these studies both the initial and final distorted waves are obtained in the static-exchange field of the ground electronic state. Differential and integral cross sections are presented and com- pared with available experimental data and with other calculations. The calculated differential cross sections for the A 'TI and a states agree poorly in magnitude, but better in shape, with available experimental data. In general the distorted-wave cross sections differ substantially from those of plane-wave-type theories such as the Born- Ochkur-Rudge approximation.

Electron impact excitation cross sections for carbon monoxide