https://iopscience.iop.org/article/10.1088/1361-6595/aac528/pdf

Contribution of surface-wave (SW) sustained plasma columns to the modeling of RF and microwave discharges with new insight into some of their features. A survey of other types of SW discharges

Using the van der Waals broadening of the spectral atomic lines to measure the gas temperature of an argon microwave plasma at atmospheric pressure

Hydrogen production from ethanol decomposition by a microwave plasma: Influence of the plasma gas flow

This review contains a theoretical background of optical emission spectroscopy and some selected examples of issues in the field of atmospheric plasmas. It includes elements like line broadening, emission of continua and molecules, radiation models, etc. Modernized expressions figuring the terms hidden in global constants where cgs units prevail are given together with restrictions of use. Easy-to-use formulas are provided to give access to essential plasma parameters.

http://iopscience.iop.org/article/10.1088/0963-0252/24/6/064003/pdf

Theoretical background of optical emission spectroscopy for analysis of atmospheric pressure plasmas

Experimental research on ethanol-chemistry decomposition routes in a microwave plasma torch for hydrogen production

We have used the collisional broadening of neutral argon lines to determine the electron density and gas temperature of a microwave discharge at atmospheric pressure. The gas temperature can be obtained from the Van der Waals broadening, provided that the Stark broadening is negligible. This can be achieved by using lines from low-lying levels (close to the ground state). On the other hand, lines corresponding to transitions from high-lying levels, which are more sensitive to Stark (quadratic) broadening, can be utilized to determine electron density. The electron density values obtained from the quadratic Stark broadening of argon atoms are in reasonable agreement with those derived from the linear Stark broadening of the Hβ line. The proposed method ensures perturbation-free access to plasma parameters, which is not the case when adding hydrogen to the discharge, even in a small amount, to observe the Balmer series lines.

Electron Density and Gas Temperature from Line Broadening in an Argon Surface-Wave-Sustained Discharge at Atmospheric Pressure

Metastable atoms play an important role in the kinetics of plasmas. A self-absorbing method has been used to determine the population density of Ar( 3 P 0 ) and Ar( 3 P 2 ) atomic metastable levels and Ar( 1 P 1 ) and Ar( 3 P 1 ) atomic resonant levels in an argon microwave discharge sustained by a surface wave at atmospheric pressure. Under the operative conditions investigated, the concentrations of these levels ranged from 10 10 −10 12  cm −3 , being in agreement with those reported in the literature, which seems to indicate that this method could be used for this calculation.

M. D. Christova

Papers

Electron Density and Gas Temperature from Line Broadening in an Argon Surface-Wave-Sustained Discharge at Atmospheric Pressure

Self-absorbing method to measure the population of the metastable levels in an argon microwave plasma at atmospheric pressure