Radiant energy – Ionic separation or analysis – With sample supply means
Patent
1993-12-29
1995-01-17
Anderson, Bruce C.
Radiant energy
Ionic separation or analysis
With sample supply means
250423P, B01D 5944, H01J 4900
Patent
active
053827945
ABSTRACT:
Disclosed is an apparatus which can serve to detect, count, size discriminate and analyze the chemical composition of particles in the air or process gases. In a preferred embodiment, the particles enter via a capillary into a differentially pumped chamber. A pulsed laser which is continuously fired is focused at an opening in the chamber. When the particles come into the path of the laser beam, the particles are fragmented and ionized. A dual time of flight mass spectrum is produced, recorded with an oscilloscope and analyzed with a computer. The mass spectrum information enables the determination of the chemical nature and concentration of the species of the particles, the particle size and the elemental composition of airborne particles in real time. Once these parameters are determined the source of the particles can be determined and eliminated from the environment and process. Thus, the inventive apparatus is advantageously used in conjunction with a facility, i.e., a semiconductor manufacturing facility, that requires ultra-clean conditions.
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"On-Line Single-Particle Analysis by Laser Desorption Mass Spectrometry" Analytical Chemestry, vol. 63, No. 18, (1991), pp. 2069-2073.
Downey Stephen W.
Emerson Adrian B.
Mujsce Anthony M.
Muller Amy J.
Reents, Jr. William D.
Anderson Bruce C.
AT&T Corp.
Burke Margaret A.
Ferguson Eileen D.
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