| Abstract: | The absolute partial electron scattering cross-section for the phosphorus L2,3-shell ionization was measured by electron spectroscopic imaging using poliovirus as a primary standard. The equivalent calcium cross-section was obtained in relation to phosphorus using the stoichiometric ratio for these two elements in hydroxyapatite, Ca10(PO4)6(OH)2. At 80kcV, the partial cross-section of phosphorus was 2.26 times 10?20 and 2.68 × 10?20cm2/atom for poliovirus and hydroxyapatite, respectively, at 150eV loss for a 15-cV energy window and an acceptance angle of 15 mrad. Under the same conditions the calcium cross-section was 0.49 × 10?20 cm2/atom at 360 eV loss. The experimental values are slightly higher than the theoretical cross-sections calculated either by hydrogenic or Hartree—Slater approaches. |
