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Title: Apparatus for focusing flowing gas streams

Abstract

Apparatus for focusing gas streams. The principle of hydrodynamic focusing is applied to flowing gas streams in order to provide sample concentration for improved photon and sample utilization in resonance ionization mass spectrometric analysis. In a concentric nozzle system, gas samples introduced from the inner nozzle into the converging section of the outer nozzle are focused to streams 50-250-..mu..m in diameter. In some cases diameters of approximately 100-..mu..m are maintained over distances of several centimeters downstream from the exit orifice of the outer nozzle. The sheath gas employed has been observed to further provide a protective covering around the flowing gas sample, thereby isolating the flowing gas sample from possible unwanted reactions with nearby surfaces. A single nozzle variation of the apparatus for achieving hydrodynamic focusing of gas samples is also described.

Inventors:
;
Issue Date:
Research Org.:
Los Alamos National Lab., NM (USA)
OSTI Identifier:
5582255
Application Number:
ON: DE86013720
Assignee:
Dept. of Energy TIC; ERA-11-005228; EDB-86-137220
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; GAS FLOW; FOCUSING; DESIGN; FLOW VISUALIZATION; NOZZLES; FLUID FLOW; 420200* - Engineering- Facilities, Equipment, & Techniques

Citation Formats

Nogar, N.S., and Keller, R.A. Apparatus for focusing flowing gas streams. United States: N. p., 1985. Web.
Nogar, N.S., & Keller, R.A. Apparatus for focusing flowing gas streams. United States.
Nogar, N.S., and Keller, R.A. Mon . "Apparatus for focusing flowing gas streams". United States.
@article{osti_5582255,
title = {Apparatus for focusing flowing gas streams},
author = {Nogar, N.S. and Keller, R.A.},
abstractNote = {Apparatus for focusing gas streams. The principle of hydrodynamic focusing is applied to flowing gas streams in order to provide sample concentration for improved photon and sample utilization in resonance ionization mass spectrometric analysis. In a concentric nozzle system, gas samples introduced from the inner nozzle into the converging section of the outer nozzle are focused to streams 50-250-..mu..m in diameter. In some cases diameters of approximately 100-..mu..m are maintained over distances of several centimeters downstream from the exit orifice of the outer nozzle. The sheath gas employed has been observed to further provide a protective covering around the flowing gas sample, thereby isolating the flowing gas sample from possible unwanted reactions with nearby surfaces. A single nozzle variation of the apparatus for achieving hydrodynamic focusing of gas samples is also described.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {5}
}