Spectroscopic characterization of atmospheric pressure um-jet plasma source

TL;DR

This study characterizes an atmospheric pressure um-jet plasma source using optical emission spectroscopy and simulation, revealing plasma parameters and active species concentrations relevant for various chemical applications.

Contribution

It provides detailed plasma parameters and species distributions for a He/O2 um-jet plasma source, combining experimental measurements with numerical modeling.

Findings

Determined gas temperature, electron density, and electron distribution function.

Measured oxygen atom and ozone concentrations in plasma and effluent.

Compared experimental spatial distributions with simulations.

Abstract

A radio frequency um-jet plasma source is studied using He/O2 mixture. This um-jet can be used for different applications as a source of chemical active species e.g. oxygen atoms, molecular metastables and ozone. Using absolutely-calibrated optical emission spectroscopy and numerical simulation, the gas temperature in active plasma region and plasma parameters (electron density and electron distribution function) are determined. Concentrations of oxygen atoms and ozone in the plasma channel and in the effluent of the plasma source are measured using emission and absorption spectroscopy. To interpret the measured spatial distributions, the steady-state species' concentrations are calculated using determined plasma parameters and gas temperature. At that the influence of the surface processes and gas flow regime on the loss of the active species in the plasma source are discussed. The measured spatial distributions of oxygen atom and ozone densities are compared with the simulated ones.