Accession Number : AD0426973


Title :   THE ROLE OF ALUMINUM AND ITS OXIDES AS SOURCES OR MODERATORS OF ELECTRONS IN SOLID PROPELLANT ROCKET EXHAUSTS.


Descriptive Note : Annual rept., 1 July 62-30 June 63,


Corporate Author : STANFORD RESEARCH INST MENLO PARK CALIF


Personal Author(s) : Spokes,G Neil


Report Date : 30 Jun 1963


Pagination or Media Count : 31


Abstract : Five theoretical approaches to an understanding of gas-particle plasmas are outlined. Labora tory experiments have been made on the micro wave properties of gas-particle plasmas. Ob served ionization can be accounted for in terms of alkali metal impurity ionization. Photo electric and electron paramagentic resonance studies of alpha,2 d gamma-alumina particles indicated that spin centers in the particles may be the cause of previously observed photo electric effect radiation with 1849 A. Studies indicate that aluminum oxide with lattice defects may have a work function of 3.7 eV. The literature values for the A12O3 band gap as determined by electrical conduction are not well understood. Pure single crystal alumina prob ably has a large band gap in consequence of which the defect-free alumina work function may be higher than 4.38 eV. Excess aluminum and lattice defects in particles of alumina in rocket exhausts may give a particle work function of 3.72 eV. (Author)


Descriptors :   *SOLID PROPELLANT ROCKET ENGINES , EXHAUST GASES , ELECTRON DENSITY , SODIUM , POTASSIUM , IONIZATION , OXIDES , EXHAUST FLAMES , PLASMAS(PHYSICS) , PHOTOELECTRIC EFFECT , OPTICAL PROPERTIES


Distribution Statement : APPROVED FOR PUBLIC RELEASE