Accession Number : AD0785136

Title :   Vaporization Kinetics and Thermodynamics of Graphite Using the High Pressure Mass Spectrometer.

Descriptive Note : Final technical rept. 1 Jul 68-15 Oct 73,


Personal Author(s) : Milne,Thomas A. ; Beachey,Jacob E. ; Greene,Frank T.

Report Date : MAY 1974

Pagination or Media Count : 224

Abstract : An apparatus for producing and sampling graphite vapor was developed and studies of the vaporization of graphite were performed. An all-graphite Knudsen cell was heated to about 3300K in vacuum without significant heating of the beam system walls or occurrence of objectionable outgassing. A continuously operating vacuum viewport and automatic pyrometer system allowed temperature monitoring under rapid window darkening conditions produced during vaporization runs. An extensive experimental determination of the neutral time-of-flight behavior of both carbon and low temperature gaseous species was done. Various ionic carbon clusters are identified. Experimental design and equipment are discussed. (Modified author abstract)

Descriptors :   *Graphite, *Vaporization, *Mass spectroscopy, Ions, Ionization, Vapors, Reaction kinetics, Chemical equilibrium, Laboratory equipment, Experimental design, Computer programs, Molecular beams, Mass spectra, Spectrum analysis, Ion sources, Pyrolytic graphite, Electric furnaces

Subject Categories : Ceramics, Refractories and Glass
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE