Accession Number : AD0646935

Title :   MOLECULAR BEAM SAMPLING OF UNSTABLE SPECIES FROM HIGH PRESSURE SYSTEMS.

Descriptive Note : Summary technical rept.,

Corporate Author : MIDWEST APPLIED SCIENCE CORP LAFAYETTE IND

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

Report Date : 01 FEB 1967

Pagination or Media Count : 20

Abstract : A technique has been developed for the mass spectrometric sampling of high temperature systems at atmospheric pressure and above. The gases to be sampled are expanded as a free jet, which is collimated into a molecular beam and introduced into the ion source of a mass spectrometer. Corrections must be made for two phenomena, mass separation and nucleation, which may accompany this sampling process. It has been possible to quantitatively sample stable products and free radicals from atmospheric and low pressure flames using a water-cooled probe. Condensible species have also been sampled using a probe in thermal equilibrium with the gas. It has not, however, been possible to sample with a cold probe species which form refractory condensed phases. These negative results with condensible species are attributed to interactions of the probe with the gas prior to the expansion. (Author)

Descriptors :   (*MASS SPECTROSCOPY, *THERMOCHEMISTRY), (*FLAMES, *HIGH PRESSURE), SAMPLING, MOLECULAR BEAMS, RAREFIED GAS DYNAMICS, NUCLEATION, KINETIC THEORY, GASES

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE