Abstract
It is well known that the density matrix of an atomic 1P state can be fully determined by investigating the polarization and anisotropy of its spontaneous emission. By means of electron-photon coincidence techniques a complete determination of 1S → 1P excitation amplitudes is possible, as demonstrated by several groups. We point out that a complete measurement of a 3×3 polarization matrix in electron-photon coincidence experiments permits one to determine at most five real parameters of the excited-state density matrix for every scattering angle. In the case of an S → D excitation this is sufficient information to determine completely the complex scattering amplitudes. The effect of unresolved hyperfine structure or fine structure in the Russell-Saunders coupling approximation is easily incorporated into the description by inserting two reduction coefficients, one for the orientation and one for the alignment. These coefficients depend exclusively on geometrical factors.
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© 1980 Plenum Press, New York
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Nienhuis, G. (1980). The Possibility of a Complete Determination of Scattering Amplitudes for S → D Excitation by Electron-Photon Coincidence Measurements. In: Kleinpoppen, H., Williams, J.F. (eds) Coherence and Correlation in Atomic Collisions. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2997-8_10
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DOI: https://doi.org/10.1007/978-1-4613-2997-8_10
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