Date of this Version
PHYSICAL REVIEW LETTERS 119, 093401 (2017)
We measure the integrated Stokes parameters of light from Zn (4s4p)43P0,1-(4s5s)53S1 transitions excited by a transversely polarized electron impact at energies between 7.0 and 8.5 eV. Our results for the electron-polarization-normalized linear polarization Stokes parameter P2, between incident electron energies 7.0 and 7.4 eV, are consistent with zero, as required by basic angular-momentum coupling considerations and by recent theoretical calculations. They are in qualitative disagreement with previous experimental results for the P2 parameter.