O'Neill, R.W. and van der Burgt, P.J.M. and Dziczek, D. and Bowe, P. and Chwirot, S. and Slevin, J.A.
Polarization Correlation Measurements of Electron Impact Excitation of Hs2pd at 54.4 eV.
Physical Review Letters, 80 (8).
First direct measurements are reported of the linear reduced Stokes parameters P1,P2 for H(2p)
excited by electron impact at the benchmark energy of 54.4 eV. The results differ significantly from
previous values deduced from angular correlation measurements which are in serious conflict with all
sophisticated theoretical approaches. Our results support the trend of theoretical predictions for P2
and confirm that its value is negative at electron scattering angles above 100±, as predicted by theory.
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