Collisional reaction interface (CRI)

The proprietary collisional reaction interface (CRI) used first in the Varian ICP-MS 820 and later in the Bruker ICP-MS Aurora M90 and Analytik Jena Plasmaquant  is used to destroy interfering ions. These ions are removed by injecting a collisional gas (He), or a reactive gas (H₂), or a mixture of the two, directly into the plasma as it flows through the skimmer cone and/or the sampler cone. Supplying the reactive/collisional gas into the tip of the skimmer cone induces extra collisions and reactions that destroy polyatomic ions in the passing plasma. Fundamentally CRI is a mini- Collision/Reaction Cell installed in front of the parabolic Ion Mirror optics.