Accession Number : ADA114868

Title :   Fundamental Studies of the Structure and Chemistry of Solid Surfaces.

Descriptive Note : Final rept. 1 Jul 77-31 Dec 80,


Personal Author(s) : Merrill,Robert P

PDF Url : ADA114868

Report Date : 31 Dec 1980

Pagination or Media Count : 5

Abstract : The objective of this project was to examine the decomposition of hydrazine on iridium from a molecular point of view. An understanding of the decomposition reaction is critical to the development of catalytic thruster engines which are less prone to catalyst deactivation and poisoning than present devices. The surface techniques employed to follow the reaction included reactive molecular beam scattering, temperature, programmed desorption, Auger spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet photoelectron spectroscopy. These techniques allowed determination of most of the salient features of the reaction sequence of hydrazine decomposition on the (111) face of iridium. At least three parallel channels for the production of NH3 were found. Branching ratios and time constants were determined for each of these reactions. The results clearly indicated which reaction mechanism is responsible for thruster 'lights-off' as well as indicating a mechanism for catalyst decomposition and break-up.

Descriptors :   *Auger electron spectroscopy, *Photoelectron spectra, *Molecular beams, *Hydrazines, *Decomposition, Molecular structure, Solids, Surfaces, Iridium, Computer programming, Thrusters, Engines, Catalysts, Deactivation, Scattering, X Ray photoelectron spectroscopy, Desorption

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Particle Accelerators

Distribution Statement : APPROVED FOR PUBLIC RELEASE