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Importance of spin–orbit interactions for the He 2lnl' states revealed by a novel use of angle-resolved photoelectron spectroscopy.

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Canton,  S. E.
Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

Wills, A. A., Sokell, E., Gorczyca, T. W., Feng, X., Wiedenhoeft, M., Canton, S. E., et al. (2002). Importance of spin–orbit interactions for the He 2lnl' states revealed by a novel use of angle-resolved photoelectron spectroscopy. Journal of Physics B: Atomic, Molecular and Optical Physics, 35(15), L367-L374. doi:10.1088/0953-4075/35/15/105.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-8A51-9
Abstract
The triplet character of doubly excited 2lnl' resonances close to the He+ (N = 2) ionization threshold has been seen to affect the angular distribution of photoelectrons associated with the He+ (1s) state: a peak has been observed at a photon energy just below the N = 2 threshold when the photoelectrons are detected at 90° with respect to the photon polarization direction. This is forbidden in pure LS-coupling and therefore the observation immediately indicates the presence of triplet configurations due to spin–orbit interactions. Such weak interaction effects are usually overwhelmed by LS-allowed processes, particularly in such a low-Z atom, but the choice of observation angle in this case desensitizes the measurements to the dominant ionization processes. The results have been reproduced by R-matrix MQDT calculations which also indicate that all seven relativistically allowed Rydberg series are present.