Accession Number : AD0651458

Title :   DIRECT MASS SPECTROMETRIC SAMPLING OF HIGH PRESSURE SYSTEMS.

Descriptive Note : Summary technical rept.,

Corporate Author : MIDWEST RESEARCH INST KANSAS CITY MO

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

Report Date : 08 MAY 1967

Pagination or Media Count : 36

Abstract : The extension of direct mass spectrometric sampling to inorganic systems at higher pressures offers advantages in the type of species and reactions that can be studied. One method involves an initial expansion as a free jet, which is subsequently collimated into a molecular beam. Knowledge of such free-jet expansions is sufficient to predict the principal phenomena, including mass separation and homogeneous nucleation. A three-stage, differentially pumped sampling system has been applied to the sampling of flames, to the observation of clusters in argon, and to the study of the behavior of Hg and CsCl in Ar and N2 carrier gases. A preliminary consideration of the kinetics of growth of the species Ar2 indicates the collisions between molecules at very low thermal energies and densities are important.

Descriptors :   (*MASS SPECTROSCOPY, *SAMPLING), (*HIGH PRESSURE, MASS SPECTROSCOPY), NUCLEATION, AERODYNAMIC CHARACTERISTICS, MOLECULAR BEAMS, DYNAMICS, THERMOCHEMISTRY, FLAMES, INORGANIC COMPOUNDS, SAMPLERS

Subject Categories : Inorganic Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE