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    Novel technique for the extraction of ionization profiles from spatial density measurements

    Deegan, C. M. and Markham, C. E. and Turner, M. and Vender, D. (2001) Novel technique for the extraction of ionization profiles from spatial density measurements. Review of Scientific Instruments, 72 (12). pp. 4362-4365. ISSN 0034-6748

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    A method has been devised to extract the two-dimensional ionization profiles from spatially resolved ion density measurements made in a capacitively coupled argon rf plasma. This technique is valid if the production process is ionization and the loss process is ambipolar diffusion. As this procedure calculates the total production ~ionization! term, processes such as two-step ionization and photoionization are included. The main benefit of this new technique is that it extracts ionization rates that pertain to the total ionization in the discharge. It follows that this technique could be used to determine when other ionization processes ~e.g., photo- and two-step ionization! are important. On testing with experimental data, the inversion process was observed to reproduce the original source term, thereby verifying that the iteration process converges to a real solution. The calculated ionization rate using the integral method is in good agreement with the ionization profiles obtained from the density measurements. Hence, there is now a method of determining the ionization rate that is independent of electron energy probability function measurement and that includes all ionization processes, not just ground state ionization by electron–neutral collisions.

    Item Type: Article
    Keywords: Novel technique; extraction; ionization profiles; spatial density; measurements;
    Academic Unit: Assisting Living & Learning,ALL institute
    Faculty of Science and Engineering > Chemistry
    Faculty of Science and Engineering > Research Institutes > Hamilton Institute
    Item ID: 15549
    Identification Number:
    Depositing User: Dr. Charles Markham
    Date Deposited: 22 Feb 2022 12:36
    Journal or Publication Title: Review of Scientific Instruments
    Publisher: American Institute of Physics
    Refereed: Yes
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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