Influence of Instrumental Parameters on the Kinetic Energy of Ions and Plasma Temperature for a Hexapole Collision/Reaction-Cell-Based Inductively Coupled Plasma Quadrupole Mass Spectrometer

Authors: Favre, Georges1; Brennetot, René1; Chartier, Frédéric1; Tortajada, Jeanine2

Source: Applied Spectroscopy, Volume 63, Issue 2, Pages 36A-61A and 133-259 (February 2009) , pp. 207-213(7)

Publisher: Society for Applied Spectroscopy

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Abstract:

Inductively coupled plasma mass spectrometry (ICP-MS) is widely used in inorganic analytical chemistry for element and/or isotope ratio measurements. The presence of interferences, which is one of the main limitations of this method, has been addressed in recent years with the introduction of collision/reaction cell devices on ICP-MS apparatus. The study of ion–molecule reactions in the gas phase then became of great importance for the development of new analytical strategies. Knowing the kinetic energy and the electronic states of the ions prior to their entrance into the cell, i.e., just before they react, thereby constitutes crucial information for the interpretation of the observed reactivities. Such studies on an ICP-MS commonly used for routine analyses require the determination of the influence of different instrumental parameters on the energy of the ions and on the plasma temperature from where ions are sampled. The kinetic energy of ions prior to their entrance into the cell has been connected to the voltage applied to the hexapole according to a linear relationship determined from measurements of ion energy losses due to collisions with neutral gas molecules. The effects of the plasma forward power, sampling depth, and the addition of a torch shield to the ICP source were then examined. A decrease of the plasma potential due to the torch shielding, already mentioned in the literature, has been quantified in this study at about 3 V.

Keywords: COLLISION CELL; ICP-MS; INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY; INSTRUMENTAL PARAMETERS; KINETIC ENERGY; PLASMA TEMPERATURE; POTENTIAL PLASMA; REACTION CELL; TORCH SHIELD

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370209787392111

Affiliations: 1: Commissariat à l'Energie Atomique, Saclay, DEN/DPC/SECR/LANIE, 91191 Gif-sur-Yvette Cedex, France 2: Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement, Université d'Evry-Val d'Essonne, CNRS UMR 8587, Evry, France

Publication date: February 1, 2009

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