charge transfer involving the ions of impurity gases in plasma

What is it about?

It is apparent that the contribution of asymmetric charge transfer involving light gas ions O+ or H+ to the selective excitation of certain spectral lines, with excitation energy close to 13.61 eV, can cause a significant difference in the observed intensities of iron and titanium and therefore affect the accuracy of analytical results. Therefore, such ionic lines should be avoided for the analysis of samples containing oxygen.

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Why is it important?

Analyte ionic lines with upper energy close to 13.61 eV (the ionisation energy of oxygen) show a significantly greater emission yield in the presence of oxygen than in pure noble gas. This is attributed to selective ACT caused by oxygen ions. The emission yields of analyte ionic lines with excitation energy close to 15.76 eV (the ionisation of Ar) decrease slightly at higher oxygen concentration. Therefore, such ionic lines should be avoided for the analysis of samples containing oxygen