Short DC Discharge with Wall Probe as a Gas Analytical Detector

Abstract

A new approach leading to the development of gas analytical detectors is reported. The approach is based on measurements in the near-cathode plasma of fine structures associated with atomic and molecular plasma processes of the high energy portion of the electron energy distribution function (EEDF). A short (without positive column) dc discharge with cold cathode and conducting walls was used. The EEDF measurements in a dc discharge are technically simpler and have dramatically better sensitivity than in the afterglow since temporal resolution is not required. Additional increased probe sensitivity is achieved by using a large-area, larger-radius-of-curvature conducting wall as the probe instead of the more common thin cylindrical Langmuir probe. The wall probe, being almost flat, also greatly reduces the ion current contribution to the measurements. The new approach allows for the development of micro-analytical, dc plasma electron spectroscopy (PLES) gas detectors that are operational up to atmospheric pressure.

Control of current and voltage oscillations in a short dc discharge making use of external auxiliary electrode

“…2,3 For atmospheric pressures, it is found that λ ε ≈ 100 μm and L < λ ε for typical microdischarges. The short dc discharges, including microdischarges, can be used, for instance, for plasma-chemical and surface modification applications, 7 as well as, for light sources, 8 analytical sensors, 9,10 and plasma electronic devices. 11 In contrast to semiconductor devices, plasma discharges can be used under harsh conditions related, for example, to high temperatures and radiation levels of damaged nuclear plants (such as Fukushima-like disasters).…”