H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 49/10 (2006.01) H01J 49/42 (2006.01)
Patent
CA 2343735
The present invention relates to inductively coupled plasma mass spectrometry (ICPMS) in which a collision cell is employed to selectively remove unwanted artefact ions from an ion beam by causing them to interact with a reagent gas. The present invention provides a first evacuated chamber (6) at high vacuum located between an expansion chamber (3) and a second evacuated chamber (20) containing the collision cell (24). The first evacuated chamber (6) includes a first ion optical device (17). The collision cell (24) contains a second ion optical device (25). The provision of the first evacuated chamber (6) reduces the gas load on the collision cell (24), by minimising the residual pressure within the collision cell (24) that is attributable to the gas load from the plasma source (1). This serves to minimise the formation, or re-formation, of unwanted artefact ions in the collision cell (24).
Cette invention se rapporte à la spectrométrie de masse à plasma inductif (ICPMS), et concerne une cellule de collision qui permet d'éliminer sélectivement des ions parasites indésirables dans un faisceau d'ions en les faisant entrer en interaction avec un gaz réactif. A cette fin, une première chambre (6) se trouvant sous un vide élevé est disposée entre une chambre d'expansion (3) et une seconde chambre sous vide (20) contenant la cellule de collision (24). La première chambre sous vide (6) comprend un premier dispositif optique ionique (17), tandis que la cellule de collision (24) comprend un second dispositif optique ionique (25). La première chambre sous vide (6) permet de réduire la charge des gaz sur la cellule de collision (24) en minimisant la pression résiduelle dans ladite cellule de collision (24), cette pression résiduelle étant imputable à la charge des gaz provenant de la source de plasma (1). Il est ainsi possible de minimiser la formation, ou la reformation, d'ions parasites indésirables dans la cellule de collision (24).
Thermo Fisher Scientific (bremen) Gmbh
Torys Llp
Unicam Ltd.
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