Accession Number : ADA280294


Title :   Thermal Ionization at Hot Metal Surfaces


Descriptive Note : Master's thesis


Corporate Author : CALIFORNIA UNIV BERKELEY


Personal Author(s) : Werning, Joseph R


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a280294.pdf


Report Date : Sep 1958


Pagination or Media Count : 66


Abstract : Ionization on hot tungsten, tantalum, and rhenium surfaces was studied. An atomic beam of neutral atoms effused from a Knudsen-type effusion vessel and struck a hot filament of the metal being studied. A temperature- dependent fraction of these atoms was ionized. This filament served as the ion source of a 60-degree-sector single-directional focusing mass spectrometer. According to the Saha-Langmuir theory of surface ionization the temperature dependence of ionization is related to the difference between the ionization potential of the impinging atom and the work function of the surface under consideration.


Descriptors :   *THERMAL PROPERTIES , *METALS , *SURFACES , *IONIZATION , *TUNGSTEN , *RHENIUM , *HOT WORKING , *TANTALUM , FUNCTIONS , TEMPERATURE , FILAMENTS , ATOMIC BEAMS , IONIZATION POTENTIALS , ION SOURCES , DIRECTIONAL , EFFUSION , MASS SPECTROMETERS , FOCUSING , WORK FUNCTIONS , NEUTRAL , THESES , ATOMS


Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Metallurgy and Metallography
      Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE