Argon metastable density and temperature of a 43 GHz microplasma

Navarro, Rafael; Hopwood, Jeffrey

doi:10.1063/5.0065505

Title: Argon metastable density and temperature of a 43 GHz microplasma

Journal Article · 04 January 2022 · Journal of Applied Physics

DOI: https://doi.org/10.1063/5.0065505 · OSTI ID:1847933

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Tufts Univ., Medford, MA (United States); Tufts University
Tufts Univ., Medford, MA (United States)

Argon (1s₅) metastable density and translational gas temperature are experimentally measured using laser diode absorption spectroscopy within a 43 GHz microplasma. The plasma is initiated and sustained within a photonic crystal constructed from a rectangular array of alumina rods, each 1 mm in diameter. This configuration generates stable microplasma from 10 to 600 Torr using millimeter wave power from 100 to 1200 mW. The metastable density is in the order of 10¹⁸ m^–3 at low pressure. However, Ar(1s₅) density decreases to undetectable levels with increasing pressure and wave power. The gas temperature is extracted from the Lorentzian line shape of the absorption profile at 811.53 nm. The gas temperature increases from approximately 400 K at low pressure to 2000 K at 320 Torr (427 mbar, 4.27 × 10⁴ Pa). Furthermore, these data are compared with previous results and suggest that the microplasma has a dense core of electrons that depletes the metastable density at high gas pressure and wave power.

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Research Organization:: Tufts Univ., Medford, MA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0021249

OSTI ID:: 1847933

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 1 Vol. 131; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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