The net spin rotation of an electron crossing a plane-wave pulse equals -a_e^2/2 times the signed area swept by the vector potential, i.e. the pulse helicity, for arbitrary pulse shapes.
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Net electron spin rotation in a plane-wave pulse: Holonomy set by the anomalous magnetic moment
The net spin rotation of an electron crossing a plane-wave pulse equals -a_e^2/2 times the signed area swept by the vector potential, i.e. the pulse helicity, for arbitrary pulse shapes.