The high partial wave phenomenon of spin changing atomic transitions

BERRINGTON, K. A. (2006). The high partial wave phenomenon of spin changing atomic transitions. Journal of physics B: Atomic, molecular and optical physics, 39, 3873-3887.


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The collisional transition between two highly excited atomic states with different spin is investigated theoretically. Taking helium-like n1S − n3P as an example, it is found that the transition is driven in the highly ion-ized Fe ion purely by exchange, and the cross section becomes increasingly dominated by partial waves of high orbital angular momentum as the scattering energy increases. Whereas for the near-neutral Li ion the transition is dominated by channel coupling in low partial waves. Analytical bench-marks and numerical methods are developed for the accurate calculation of the exchange integral at high angular momentum. It is shown how the partial wave and energy dependence of the collision strength for high n spin changing transitions in the highly ionized ion is related to the overlap of the extended atomic orbitals.

Item Type: Article
Additional Information: © Institute of Physics and IOP Publishing Limited
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Modelling Research Centre > Materials Modelling group
Identification Number:
Page Range: 3873-3887
Depositing User: Ann Betterton
Date Deposited: 22 Jun 2007
Last Modified: 18 Mar 2021 13:51

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