MBMS sampling from highly heated gas mixtures (1000-3000 K) and weakly ionized RF plasmas (800-2800 K) or laser plasmas (5000-20,000 K)
- Laboratoire des Jets Moleculaires, Gif-sur-Yvette (France)
The properties of the free jet expansion and molecular beam skimming can be applied to the sampling of a wide variety of gaseous media, as those considered in this workshop: reactive systems, high temperature gases, flames, plasma flows, shock zone gases, laser ablation plumes, gas phase in CVD or in high temperature corrosion, etc. In the authors` laboratory, as well as in many molecular beam groups, the MBMS sampling is not generally made for analysing the gas stagnating in the nozzle, but for optimizing and using the beam source in research experiments. Nevertheless, this beam optimization has been of great interest to investigate and minimize the distortions through the interface used for MS sampling. They are due to the reality of the gas, the deviations from ideal free jet expansion, and the possible interactions along the MBMS sampling system, from the nozzle sampler to the quadrupole analyser. The first part of this paper is an historical review on the various distortions observed at Saclay in skimming, or in MBMS sampling from room temperature gases or gas mixtures. The second part deals with neutral energetic particles resulting either from the cluster generation in expansion or from the seeding and/or heating techniques. Finally the last part of the paper is devoted to recent developments in MBMS sampling of weakly ionized RF plasmas (800-2800 K) and laser sustained plasmas (5000-20000 K). The presentation is made with large reference to the authors` previous papers, especially their later review on jets and beams.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- OSTI ID:
- 110829
- Report Number(s):
- NREL/CP-433-7748; CONF-9410343-; ON: DE95004052; TRN: 95:005145-0004
- Resource Relation:
- Conference: Applications of free-jet, molecular beam, mass spectrometric sampling conference, Estes Park, CO (United States), 11-14 Oct 1994; Other Information: PBD: Mar 1995; Related Information: Is Part Of Applications of free-jet, molecular beam, mass spectrometric sampling: Proceedings; Milne, T. [ed.]; PB: 305 p.
- Country of Publication:
- United States
- Language:
- English
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