Abstract by Jessica Larsen
Chemistry and Biochemistry
Ion Transport and Beam Formation in a Commercial ICP-MS
The inductively coupled plasma mass spectrometer (ICP-MS) has been the premier instrument of elemental analysis since it was introduced in the 1970s. Despite its maturity, the formation of the ion beam in the ICP-MS still suffers from space charge effects. The effects of space charge are difficult to model and rely on experimental data for verification. We have developed a method for experimentally profiling the ion beam in a working ICP-MS. In this work, we have characterized beam formation by imaging the cross section of the ion beam with planar laser-induced fluorescence in the second vacuum stage of a commercial ICP-MS. The observed beam profiles disagree with those calculated computationally. This suggests a need for improved computational models and instrument design.