Bulletin of the American Physical Society
60th Annual Meeting of the APS Division of Plasma Physics
Volume 63, Number 11
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session PP11: Poster Session VI: Relativistic Laser Plasma Interaction and Beam Physics; Boundary; MHD and Stability, Transients; FRC; Dusty Plasmas; Basic Studies; Computational and Diagnostic Methods (2:00pm-5:00pm)
Wednesday, November 7, 2018
OCC Room: Exhibit Hall A1&A
Abstract ID: BAPS.2018.DPP.PP11.113
Abstract: PP11.00113 : Time dependent metastable dynamics in low temperature argon plasmas.*
(Queens Univ Belfast)
Edward E Thomas
In the development of optical emission spectroscopy (OES) based plasma diagnostics, it is critical to have a detailed understanding of the atomic processes that give rise to the emission of light. It is known that relative metastable population abundances in a plasma (the so-called “metastable fractions”) play an important role in the population of excited states. Typical rate coefficients for excitation from metastable states are large compared to coefficients for ground state excitation. Thus, metastable excitation can play a large role in the spectral emission of a plasma, even when the relative population of these states is small.
We report on recent discoveries with regards to the evolution of metastable states in low temperature argon plasmas, using atomic data from a Breit-Pauli R-Matrix with PseudoStates (BPRMPS) calculation and a Generalized Collisional Radiative (GCR) model. We show that the time dependent evolution of metastable populations can impact relative line heights from spectral emission, and discuss the impact this effect can have on line ratio diagnostics using OES. Finally, we discuss when metastable fractions can be well approximated by their equilibrium values.
*This work is supported by the NSF EPSCoR program through grant number OIA-1655280.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.PP11.113
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