Glow discharge mass spectrometer

Details Glow discharge mass spectrometer Glow discharge mass spectrometer

1987-06-08

1989-08-01

Fields, Carolyn E.

Radiant energy

Ionic separation or analysis

With sample supply means

250281, 250282, 250423R, H01J 4700

Patent

active

048535397

ABSTRACT:
There is provided a mass spectrometer adapted for the elemental analysis of a sample, especially a solid sample, comprising a glow discharge ion source which yields ions characteristic of the elements in the sample. The background spectrum produced by such a mass spectrometer is substantially reduced by cooling the ion source below 20.degree. C., and preferably below -100.degree. C., thereby increasing the sensitivity and the accuracy of the spectrometer. The cooling of the ion source is preferably accomplished by flowing liquid nitrogen through a heat exchanger disposed in good thermal contact with it.

REFERENCES:
patent: 3418513 (1968-12-01), Elliott
patent: 3770954 (1973-11-01), Davis
patent: 3798447 (1974-03-01), Lanusse et al.
patent: 4039828 (1977-08-01), Pokar et al.
Analytical Chemistry, "Glow Discharge Mass Spectrometry", Feb. 1986, vol. 58, No. 2, pp. 341A-356A, W. W. Harrison et al.
Graham, W. G., "Wall Material and Wall Temperature Effects on Negative Ion Production in a Hydrogen Plasma", Journal of Physics & Applied Physics, vol. 16, No. 10, 10/83, pp. 1907-1915.
T. J. Loving et al., "Dual-Pin Cathode Geometry for Glow Discharge Mass Spectrometry", Anal. Chem., 1983, 55, pp. 1526-1530.

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