Compact hydrogen/helium isotope mass spectrometer

Details Compact hydrogen/helium isotope mass spectrometer Compact hydrogen/helium isotope mass spectrometer

1995-05-04

1996-08-13

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

250288, H01J 4926

Patent

active

055458947

ABSTRACT:
The compact hydrogen and helium isotope mass spectrometer of the present invention combines low mass-resolution ion mass spectrometry and beam-foil interaction technology to unambiguously detect and quantify deuterium (D), tritium (T), hydrogen molecule (H.sub.2, HD, D.sub.2, HT, DT, and T.sub.2), .sup.3 He, and .sup.4 He concentrations and concentration variations. The spectrometer provides real-time, high sensitivity, and high accuracy measurements. Currently, no fieldable D or molecular speciation detectors exist. Furthermore, the present spectrometer has a significant advantage over traditional T detectors: no confusion of the measurements by other beta-emitters, and complete separation of atomic and molecular species of equivalent atomic mass (e.g., HD and .sup.3 He).

REFERENCES:
patent: 5438194 (1995-08-01), Koudijs et al.
G. C. Theodoris et al., "Charged Particle Transmission through Cylindrical Plate Electrostatic Analyzers," Rev. Sci. Instrum. 39, 326 (1968).
Herbert Funsten et al., "Ultrathin Foils Used for Low-Energy Neutral Atom Imaging of the Terrestrial Magnetosphere," Opt. Eng. 32, 3090 (1993).
Y. K Bae et al., "A Search for H.sub.2.sup.-, H.sub.3.sup.-, and Other Metastable Negative Ions," in Production and Neutralization of Negative Ions and Beams, K. Prelec, Ed. (American Institute of Physics, New York, 1984) pp. 90-95.
H. H. Andersen et al. "Sputtering Yield Measurements," in Sputtering by Particle Bombardment I, R. Behrisch, Ed., (Springer-Verlag, 1981) p. 166.

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