Vp. Petukhov et al., AL K-ALPHA SATELLITE POLARIZATION MEASUREMENTS IN METAL AND IN SAPPHIRE (AL2O3), Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 75(1-4), 1993, pp. 17-19
The polarization fraction of Al K(alpha), satellite lines of Al metal
and Al oxide (alpha-Al2O3, SaPPhire) has been measured at 3.2 MeV Heion bombardment. The observed polarization fraction of aluminium oxide
is approximately 50% lower than that of aluminium metal.