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Experimental ionization cross‐sections of phosphorus and calcium by electron spectroscopic imaging
Author(s) -
Heng Y. M.,
Simon G. T.,
Boublik M.,
Ottensmeyer F. P.
Publication year - 1990
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1990.tb03055.x
Subject(s) - ionization , cross section (physics) , chemistry , phosphorus , atom (system on chip) , atomic physics , electron , atomic number , calcium , analytical chemistry (journal) , ion , physics , nuclear physics , organic chemistry , quantum mechanics , chromatography , computer science , embedded system
SUMMARY The absolute partial electron scattering cross‐section for the phosphorus L 2,3 ‐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, Ca 10 (PO 4 ) 6 (OH) 2 . At 80kcV, the partial cross‐section of phosphorus was 2.26 times 10 −20 and 2.68 × 10 −20 cm 2 /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 cm 2 /atom at 360 eV loss. The experimental values are slightly higher than the theoretical cross‐sections calculated either by hydrogenic or Hartree—Slater approaches.