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Forward–backward asymmetry in electron impact ionization of CO

Noboru Watanabe Masahiko Takahashi 東北大学 DOI:10.1063/5.0006256

2020.04.22

概要

We experimentally investigate the molecular-orientation dependence of high-energy electron-impact ionization of CO. The direction of the molecular-axis with respect to the momentum transfer vector K is deduced from the angular correlation between the fragment ion and the scattered electron. The experimental results on the 3 2Π ionization reveal that at small momentum transfer, the ionization probability near the threshold is higher when K points toward the C atom along the molecular axis than when it is in the opposite direction. Such a forward– backward asymmetry does not appear in single-photon ionization and requires non-dipole contributions. It is also shown that the {4 2Σ + + 5 2Σ + + 6 2Σ + } ionization preferentially takes place in the vicinity of the molecular orientation parallel to K at small momentum transfer, while non-dipole contributions cause the decrease in the relative intensity of the parallel direction.

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