Rare Earth Element analyses (SIMS)

Rare earth element analyses with IMS 7f-GEO
When analyzing Rare Earth Elements in mineral samples, one has to deal with several molecular interferences of extremely close masses which cannot be separated using typical high mass resolution conditions.

To address such mass interference issues, energy filtering of the secondary ions with a well-controlled energy bandwidth is mandatory. The energy filtering technique is based on the fact that the energy distribution is narrower for polyatomic species compared to monoatomic species. By moving the energy slit off axis or by applying an offset to the sample voltage, it is possible to separate monoatomic from isobaric cluster ions.

For measuring trace elements content, a high-brightness oxygen source is also essential in order to obtain µm-scale elemental information with high sensitivity.

The IMS 7f-GEO has been designed to meet all these requirements as shown in the above example.

Rare Earth Element analysis on Allende meteorite and terrestrial Antigorite are measured at ppm concentration level.