Coincidence laser spectroscopy (CLS) for the detection of ions in ICP-MS (ICP-MS-CLS). A feasibility study

摘要: This paper reports a theoretical study of the feasibility using laser-excited ionic fluorescence in time correlation with ion counting, termed coincidence laser spectroscopy (CLS), for improved specificity detection ions ICP-MS. The technique is here named ICP-MS-CLS. A number factors are considered including: preferred instrumental configuration, simulation performance optical detector and step reducing background, selected isotopes, 10Be+, 55Fe+, 63Ni+, 90Sr+, 99Tc+, 147Pm+, 238U+, 238Pu+ 241Am+, which might be appropriate candidates ICP-MS-CLS detection, power required to attain saturation, effects energy spread on pumping efficiency, abundance sensitivity adjacent isotopes same element, limits obtainable under variety scenarios. ICP established as an ideal source elemental mass spectrometry, but shown here, produced too large optimum because Doppler shifted extent that not all them would excited efficiently by narrow-line source. necessitates inclusion cooler into configuration so maybe brought resonance 100% efficiency. calculations show simple spectra, such 90Sr+ can repetitively pumped produce photon burst, reduce effect very high backgrounds, 106 cps 1010 at mass, low levels improve 2–3 orders magnitude compared normal technique. Optical abundances 10−5–10−9 achievable which, combined 10−5, yields overall sensitivities 10−10–10−14. order techniques accelerator spectrometry (AMS) or ionisation (RIMS). much less efficient undergo trapping emit only one when and/or exhibit hyperfine structure distributes oscillator strength over several components. These significantly degrade indicate requirement further refinement terms two-colour excitation, quenching meta-stable levels, enable recycling pumping.