Related Experiment Video
Updated: Mar 20, 2026

Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
Published on: May 25, 2021
Note: The expansion of possibilities for plasma probe diagnostics
P E Masherov1, V A Riaby1, V K Abgaryan1
1Research Institute of Applied Mechanics and Electrodynamics of the Moscow Aviation Institute (National Research University), Moscow 125080, Russia.
Abstract:
The determination of ion mass for low-pressure Maxwellian plasmas has been proposed. It can be done using Langmuir probe measurements and the Bohm formula for the ion current density to a floating probe, due to this formula's reliance on ion mass. This goal was achieved by accurate measurements of xenon plasma parameters in the inductive discharge at pressure p = 2 ⋅ 10(-3) Torr using the Plasma Sensors VGPS-12 probe station with the cylindrical Langmuir probes. The analysis of measurement data showed that in these conditions, the Bohm effect was valid with engineering-level precision, resulting in the experimental Bohm coefficient CBCyl ≈ 1.13 for cylindrical probes.
Related Concept Videos
Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview
Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
Atomic Emission Spectroscopy: Lab

