Apparatus and method for isotopic ratio plasma mass spectrometry

Details Apparatus and method for isotopic ratio plasma mass spectrometry Apparatus and method for isotopic ratio plasma mass spectrometry

1995-09-01

1996-11-05

Berman, Jack I.

Radiant energy

Ionic separation or analysis

With sample supply means

250281, H01J 4912

Patent

active

055720242

ABSTRACT:
The invention comprises a method and apparatus for inductively-coupled plasma mass spectrometry which is particularly suitable for the determination of isotopic ratios.
In order to improve the precision of such determinations, the nozzle-skimmer type interface of the mass spectrometer is arranged so that the ratio ##EQU1## is greater than 0.8 mB.sup.1/2, where d.sub.s is the diameter of the orifice in the skimming member, s is the spacing between the sampling member and the skiming member, and p.sub.1 is the pressure in the region between the sampling and skimming members. Although use of the invention slightly reduces the efficiency of the interface it results in more accurate isotopic ratio determinations.

REFERENCES:
patent: 4963735 (1990-10-01), Okamoto et al.
patent: 5051584 (1991-09-01), Gray et al.
patent: 5148021 (1992-09-01), Okamoto et al.
patent: 5218204 (1993-06-01), Houk et al.
patent: 5352893 (1994-10-01), Freedman

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