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Background <p>An important problem of mass spectroscopy is the accurate determination of the concentration of various ions in the studied substance, which has undergone changes after passing through a&#xa0;high-current ion diode.</p> Aim <p>To establish the patterns of changes in the relative concentration of ion beam components passed through an ion diode.</p> Materials and methods <p>A&#xa0;self-consistent computer simulation of an ion diode is carried out using the KARAT electromagnetic code based on the particle-in-cell variation of the large particle method. We use the mode of space charge current limitation to measure the concentration of a&#xa0;multicomponent ion beam using mass spectroscopy.</p> Results and discussion <p>A&#xa0;significant change in the relative concentration of various ion types on the collector of a&#xa0;high-current ion diode is established compared to the concentrations on its emitter. A&#xa0;correction factor compensating for the detected change is proposed: if the ion diode of the mass spectrometer operates in the mode of space charge current limitation, then the amplitudes of the mass peaks should be corrected by <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10512_2025_1265_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="37" /> </InlineMediaObject> <EquationSource Format="TEX">\(\sqrt{\upmu _{i}}\)</EquationSource> </InlineEquation> to determine the relative concentration of ion cloud components.</p> Conclusion <p>The obtained results are of great importance for interpreting measurements in quantitative mass spectroscopy, as well as for determining the efficiency of separation systems.</p>

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Change in the relative concentration of ion beam components passing through a high-current diode

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Herman N. Kolesov,
  • Alexander E. Dubinov

摘要

Background

An important problem of mass spectroscopy is the accurate determination of the concentration of various ions in the studied substance, which has undergone changes after passing through a high-current ion diode.

Aim

To establish the patterns of changes in the relative concentration of ion beam components passed through an ion diode.

Materials and methods

A self-consistent computer simulation of an ion diode is carried out using the KARAT electromagnetic code based on the particle-in-cell variation of the large particle method. We use the mode of space charge current limitation to measure the concentration of a multicomponent ion beam using mass spectroscopy.

Results and discussion

A significant change in the relative concentration of various ion types on the collector of a high-current ion diode is established compared to the concentrations on its emitter. A correction factor compensating for the detected change is proposed: if the ion diode of the mass spectrometer operates in the mode of space charge current limitation, then the amplitudes of the mass peaks should be corrected by \(\sqrt{\upmu _{i}}\) to determine the relative concentration of ion cloud components.

Conclusion

The obtained results are of great importance for interpreting measurements in quantitative mass spectroscopy, as well as for determining the efficiency of separation systems.