Parity favouritism is found to play a vital role in distinguishing three types of transitions in the photoionisation of diatomic molecules. It explains why the asymmetry parameter beta is larger for Sigma +or- to Sigma +or- than for Sigma to Pi transitions. For Sigma +or- to Sigma -or+ transitions, a value of -1 for beta is predicted.
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Edward S. Chang (1978) studied this question.
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