A model for nitrogen chemisorption in ion thrustersA theoretical model describing the formation of nitrogen species subject to chemisorption on ion thruster discharge chamber surfaces is presented. Molecules, atoms, atomic ions and molecular ions are identified as the important species in the analysis. Current densities of the atomic and molecular ions predicted by the model are compared to current densities measured in the beam of a SERT II thruster. The predicted and measured values of these two current densities are shown to agree within about + or - 100%. The mechanisms involved in the erosion of a surface subjected to simultaneous nitrogen chemisorption and sputter erosion by high energy ions are also discussed.
Document ID
19800026215
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wilbur, P. J. (Colorado State University Fort Collins, Colo., United States)
Date Acquired
August 10, 2013
Publication Date
October 1, 1979
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
AIAA PAPER 79-2062
Meeting Information
Meeting: International Electric Propulsion Conference