No abstract

A plasma source ion trap (PSIT) mass spectrometer has been modified to incorporate a radiofrequency octopole ion guide/collision cell between the ion source and the mass spectrometer. This modification allows ions sampled from the plasma to undergo reactions prior to mass spectrometric analysis. This capability can obviate the need for chemical or chromatographic separation of the sample, remove mass spectral intereferences and enable formation of analytically useful molecular ions. Distinct reaction chemistries can be utilized in the octopole and/or ion trap. Performance of the instrument is dramatically improved if hydrogen gas is introduced into the octopole; molecular hydrogen reacts with Ar + and certain other plasma ions, greatly reduces their intensities, and cools and focuses the ion beam prior to its injection into the ion trap.

We characterize EUV TOF for trace analysis using NIST glasses and demonstrate nanoscale imaging on uranium oxide particles.