Measurement of concentrations of gaseous phase elements

Details Measurement of concentrations of gaseous phase elements Measurement of concentrations of gaseous phase elements

1977-09-19

1979-04-24

Wolk, Morris O.

Chemistry: physical processes

Physical processes

Crystallization

23230PC, 422 78, 422 98, 250361R, 250459, G01N 2126, G01N 2138, G01N 2764

Patent

active

041509510

ABSTRACT:
A method and apparatus for the quantitative and qualitative analysis of the elemental composition of materials in concentrations as low as a few atoms, or molecules, per cubic centimeter. When introduced into a gas stream containing an excess of an energetic metastable species of nitrogen or noble gas, the material, if atomic, is rapidly and repeatedly excited, or, if molecular, it is decomposed and subsequently certain component atoms of the molecule are excited, and thereupon fluoresce at their characteristic wavelength(s). The wavelength(s) and intensity of the emitted light (fluorescence) are determinative respectively of the identity and the concentration of the atoms of the different elements present.

REFERENCES:
patent: 3713773 (1973-01-01), Fontijn et al.
patent: 3904366 (1975-09-01), Grasenick
patent: 3926562 (1975-12-01), Williams et al.
patent: 3963928 (1976-06-01), Zolner
patent: 3973910 (1976-08-01), Fine
patent: 3977831 (1976-08-01), Fletcher et al.
Selective Laser Excitation of Charge Compensated Sites in CaF.sub.2 :Er.sup.3+* Tallant et al., J. of Chem. Physics, vol. 63, No. 5, pp. 2074-2085.
Kinetics of Nitrogen Atom Recombination, Herron et al., J. of Chem. Physics, pp. 879-885; vol. 30, #4, 4--1959.

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