Hardware manual

Overview 1

Agilent 7500 Series ICP-MS Hardware Manual 1-17

After focusing by a conventional Einzel lens, the ion beam is bent off- axis by

an Omega lens, which consists of two split- ring elements that alternately repel

and attract the ions. This Omega lens deflects the ion beam approximately 5

mm off- axis into the front plate of the quadrupole. Photons and neutral

species are not diverted off- axis and so do not enter the quadrupole. This

ensures that the system has a very low random background, resulting in

excellent detection limits.

Octopole Reaction System (ORS) (7500cs/cx)

The Octopole Reaction System (ORS) is an octopole ion guide contained

within a stainless steel vessel and pressurized with a gas, most often He or H

The ORS is positioned between the ion lens assembly and the quadrupole mass

filter (Figure 8). As ions from the sample enter this cell, they interact with the

gas, resulting in the reduction of the molecular interference, normally below

the level of the blank solution. The use of 8 rods in the octopole has greater

ion transmission efficiency compared to 6 rod (hexapole) or 4 rod

(quadrupole) systems. The ORS Eliminates key interferences arising from the

sample matrix that are not argon based and cannot be eliminated using

“traditional” approaches.