Premium
Modification of Philibert–Tixier ZAF correction for geological samples
Author(s) -
Fialin Michel
Publication year - 1988
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.1300170306
Subject(s) - ionization , electron microprobe , value (mathematics) , absorption (acoustics) , matrix (chemical analysis) , chemistry , analytical chemistry (journal) , ionization energy , electron , atomic physics , binary number , mathematics , physics , statistics , mineralogy , ion , optics , nuclear physics , arithmetic , organic chemistry , chromatography
Two steps are usually used in electron microprobe correction: (1) development of a theoretical mode based on physical phenomena within pure or binary targets; and (2) simplification of certain complexities due to multi‐element samples by using average coefficients in the theoretical equations. It is proposed to use a more detailed method of estimating the general correction coefficients concerning A/Z relationships in the absorption and ionization terms of the theoretical formulation. In the absorption formulation the factor h is taken as (1.2 ∑ C i A i /Z i 2 )/ (1 + K a ). The value of a is given as ‐1. In the ionization relationship M = (∑ C i Z i /A i )/(1 + K b ) with b = E 0 /100, where E 0 is the accelerating voltage in kV. K , deduced from experimental results, is given as K = ∑ C i ( Z i ‐ Z¯ ), where Z¯ is the average atomic number of the target. These values are derived empirically through direct measurements on samples whose correction properties induce normally strong analytical errors: oxides with 11 ⩽ Z ⩽ 14 analysed within a heavy matrix.