Radiant energy – Ionic separation or analysis – Methods
Patent
1983-10-27
1987-01-06
Anderson, Bruce C.
Radiant energy
Ionic separation or analysis
Methods
250288, 250423P, 423 2, B01D 5944
Patent
active
046348646
ABSTRACT:
An ultrasensitive mass spectrometry method based on multiphoton sub-Doppler resonance ionization is used to measure abundance sensitivities. The method preferentially ionizes a selected isotope in a sample by using Doppler-free resonant multiphoton ionization to produce an enhanced ratio of selected isotopes. As necessary or desired, selected isotope ions are preferentially ionized by using a second Doppler-free resonant multiphoton ionization to provide an additional isotope enhancement. The ions produced are injected into a mass spectrometer (24). Isotopic spectrum analysis of the ions is performed by the spectrometer (24) and the ions are then detected by a detector (26) such as a particular photon multiplier capable of observing a single ion. In one embodiment, at least one of the steps of preferentially ionizing the selected isotope is accomplished by two counter propagating laser beams of slightly different frequencies.
REFERENCES:
patent: 4020350 (1977-04-01), Ducas
patent: 4115078 (1978-09-01), Jannes et al.
patent: 4166219 (1979-08-01), Ausschmitt et al.
patent: 4442354 (1984-08-01), Hurst et al.
"Laser Spectroscopy for Sensitive Detector", Whitaker et al., Proceedings of SPIE-The International Soc. for Optical Eng., Apr. 23-24, 1981.
Clark Charles W.
Lucatorto Thomas B.
Whitaker Tom J.
Anderson Bruce C.
Atom Sciences, Inc.
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