Physical analysis demonstrates asymmetric photoelectron momentum distributions in carbon monoxide, indicating orbital mixing during one-photon single ionization.
The photoelectron momentum distribution (PMD) for the linear (in intensity) process of one-photon single ionization of carbon monoxide is examined in the polarization plane for several orientations of the linear polarization vector with respect to the molecular axis. For a pulse bandwidth broader than the energy gap between the highest occupied molecular orbital (HOMO) and HOMO-1, the PMD is found to be mixed with HOMO and HOMO-1 signatures because electrons are emitted from these initial orbitals. We show that the asymmetry of the HOMO is strongly revealed in the PMD for any molecular orientation. The backward-forward asymmetry in the PMD and the normalized asymmetry are used as probes of the degree of mixing.
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Ambalampitiya et al. (2024) studied this question.
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