Abstract
An ultrasensitive mass spectrometer is proposed in which the chemical and isotopic selectivity possible with laser ionization is combined with the mass selectivity of a conventional mass spectrometer to achieve abundance sensitivities in the range of 10 13. The ionization stage incorporates two-photon sub-Doppler resonance ionization in order to achieve optimum isotopic enhancement of the selected species and to provide high ionization efficiency for the entire maxwellian distribution of the sample. The limits on selectivity and sensitivity due to charge exchange and laser power broadening effects are discussed for the case of 88Sr/ 90Sr, an example which is of practical interest and which poses a difficult test for any mass spectrometric technique.
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