The SERI High Pressure, Molecular-beam Mass Spectrometric Sampling System PDF Download
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Author: Michael N. Soltys Publisher: ISBN: Category : Biomass chemicals Languages : en Pages : 0
Book Description
The theory of high pressure, molecular-beam mass spectrometric sampling is briefly reviewed, with a discussion of the principal phenomena that affect results. The hardware and circuits of the sampling and data acquisition system are described. Finally, system performance and capability are reviewed. Representative data outputs are included.
Author: Michael N. Soltys Publisher: ISBN: Category : Biomass chemicals Languages : en Pages : 0
Book Description
The theory of high pressure, molecular-beam mass spectrometric sampling is briefly reviewed, with a discussion of the principal phenomena that affect results. The hardware and circuits of the sampling and data acquisition system are described. Finally, system performance and capability are reviewed. Representative data outputs are included.
Author: Michael N. Soltys Publisher: ISBN: Category : Biomass chemicals Languages : en Pages : 32
Book Description
The theory of high pressure, molecular-beam mass spectrometric sampling is briefly reviewed, with a discussion of the principal phenomena that affect results. The hardware and circuits of the sampling and data acquisition system are described. Finally, system performance and capability are reviewed. Representative data outputs are included.
Author: John Hu-sen Chang Publisher: ISBN: Category : Gas dynamics Languages : en Pages : 74
Book Description
In this paper experiments are preported on beam intensity and mass separation effects for a mass spectrometer sampling system designed for chemically reacting gases at 1,000K and one atmosphere. The coupling between the reacting chamber and the mass spectrometer was achieved by a supersonic molecular beam of the type suggested by Kantrowitz and Grey. The initial expansion was accomplished by a free jet from a continuum sonic orifice. The system was designed to minimize the change in chemical composition of the sampled gas by orifice boundary layer contamination, sample-skimmer interaction, chemical reactions and condensation during the expansion, mass separation and background gas infiltration. Beams from known sources were generated and sampled. The observed beam intensity and composition were compared to those calculated from theory. This paper also provides a compact statement of the present state of the art of molecular beam technology as it applies to sampling, together with enough background material to illustrate the main requirements imposed on molecular beam systems in this application. (Author).
Author: Frank T. Greene Publisher: ISBN: Category : Languages : en Pages : 20
Book Description
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).
Author: Thomas A. Milne Publisher: ISBN: Category : Languages : en Pages : 36
Book Description
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.
Author: Paul W. Dimiduk Publisher: ISBN: Category : Languages : en Pages : 14
Book Description
The general concept of a probe system is described that will allow the mass spectrometric analysis of the pressure environments near 1 atmosphere and above which are of current practical interest. Applications include the detection of both the stable and highly unstable gas molecules present in reacting mixtures and determining the vapor species existing over reacting solids in any temperature range. Illustrative examples are given to show some of the kinds of important materials problems whose solutions may be speeded by application of this device. The current development status and the major remaining problems associated with this device are summarized. (Author).
Author: Michael N. Soltys
Author: Michael N. Soltys
Author: Michael N. Soltys
Author: C. A. Stearns
Author: John Chang
Author: John Hu-sen Chang
Author: Frank T. Greene
Author: Gary Raymond Parr
Author: Carl Vernon Wikstrom
Author: Thomas A. Milne
Author: Paul W. Dimiduk