Means for removing unwanted ion from an ion transport system...

Details Means for removing unwanted ion from an ion transport system... Means for removing unwanted ion from an ion transport system...

2007-05-25

2008-03-04

Wells, Nikita (Department: 2881)

Radiant energy

Ionic separation or analysis

C250S282000, C250S288000, C250S42300F

Reexamination Certificate

active

07339163

ABSTRACT:
The present invention relates to inductively coupled plasma mass spectrometry (ICPMS) in which a collision cell is employed to selectively remove unwanted artifact 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 artifact ions in the collision cell (24).

REFERENCES:
patent: 6259091 (2001-07-01), Eiden et al.

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