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Application of two-photon absorption laser induced fluorescence to validate actinometry measurements of absolute atomic oxygen number density based on improved EEDFs obtained from PIC simulations.

Conway, Jim ORCID: 0000-0003-4282-2240, Kechkar, Samir, O'Connor, Noel E. ORCID: 0000-0002-4033-9135, Crowley, A., Gudimenko, E., Turner, Miles M. ORCID: 0000-0001-9713-6198 and Daniels, Stephen (2011) Application of two-photon absorption laser induced fluorescence to validate actinometry measurements of absolute atomic oxygen number density based on improved EEDFs obtained from PIC simulations. In: International Conference on Phenomena in Ionized Gases (ICPIG), 28 Aug - 2 Sept 2011, QUB, Belfast, UK.

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Abstract

Actinometry is a non-invasive optical technique that allows absolute atomic oxygen density determination within a plasma provided certain conditions are met. However, the technique is sensitive to to the accuracy of the Electron Energy Distribution Function (EEDF). A Maxwellian distribution is often used for actinometry calculations, but this is typically just an approximation. A Particle in Cell (PIC) code is used to try and generate a more accurate EEDF to improve the actinometry results. To do this the electron density in the plasma is measured using a hairpin probe and compared to the electron density predicted by the PIC code. The code is adjusted to get a reasonable agreement with the hairpin probe electron densities. The corresponding EEDF from the PIC code is then used in the actinoometry model to calculate the atomic oxygen density in the plasma. The actinometry results are compared to oxygen density measurements made using Two-photon Absorption Laser Induced Fluorescence to validate the actinometry results.

Item Type:Conference or Workshop Item (Poster)
Event Type:Conference
Refereed:No
Subjects:Physical Sciences > Plasmas
Physical Sciences > Detectors
Physical Sciences > Plasma processing
Physical Sciences > Photonics
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:20925
Deposited On:26 Nov 2015 10:02 by James Conway . Last Modified 16 Aug 2022 09:58

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