Mass-Spectrometric Studies of Graphite Vaporization at High Temperatures
Abstract
The report discusses the vaporization of carbon, by considering three main types of experiments. Two involved heating in vacuum with direct expansion of the carbon vapor into the mass spectrometer via a molecular beam. Most of the emphasis has been on observing equilibrium carbon species from graphite Knudsen cells and freely evaporating hot graphite surfaces. The major determinant factor in the current vaporization studies has been the realization of the anisotropic properties of pyrolytic graphite. An RF heating system, pyrolytic graphite shielded cell, high-pressure modulated molecular beam sampling system, Nuclide mass spectrometer with ion counting and analog detection, fast peak switching and time-of-arrival velocity analyses system have been designed, built, debugged and tested with permanent gases and with carbon vapor and stand ready for further elucidation of carbon vapor composition at high temperatures.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1971
- Accession Number
- AD0732271
Entities
People
- Frank T. Greene
- Jacob E. Beachey
- Thomas A. Milne