Validation of Collisional Radiative Models for Low Temperature Xenon Plasmas

Collisional radiative (CR) models for neutral xenon (Xe I) and singly-charged xenon ion (Xe II) have been recently developed by Chaplin, et al. This poster will cover recent work to experimentally validate the Xe II CR model for future non-intrusive measurements of plasmas with densities of 10¹⁸ m^-3 and temperatures of 10 eV. Additionally, efforts to extend this work to time-resolved OES will be discussed. Discrepancies between the existing Xe I CR model developed by Karabadzhak et al. and Chaplin et al. are explored, and explanations for these discrepancies are provided to justify the structure and theoretical database used in both the new Xe I and Xe II CR models. An experiment to validate the Xe II CR model was carried out in the anode region of the UCLA Plasma interactions facility by comparing optical emission spectroscopy (OES) with the Xe II CR model with Langmuir probe measurements. The spatially resolved electron temperature and density measurements show reasonable agreement between the two diagnostics. The 441 nm to 605 nm emission line ratio appears to have the most promise for non-intrusive electron temperature measurements with the Xe II CR model. Also, the bandwidth limitations of the Xe II CR model have been explored, and the 441 nm to 605 nm line ratio may be useful for time-resolved optical measurements as well.