Polarization of Lyman- α Radiation Produced by Direct Excitation of Hydrogen Atoms by Photon Impact

The polarization of Lyman-α radiation resulting from the direct excitation of hydrogen atoms by proton impact has been measured in the energy range 2-21 keV. A Brewster's angle polarization analyzer was used to measure the polarization of the observed Lyman-α radiation. The results are compared with the four-state Sturmian calculation of Gallaher and Wilets.