File:LA-ICP-MS.JPG
LA-ICP-MS
(Left side of photograph: ICP-MS, Right side of photograph: LA)
Photo courtesy: Gübelin Gemmological Laboratory, Ltd
The MS identifies and quantifies elements in terms of mass and charge and can detect 65 elements and their relative amounts, even when present in only a few parts per billion. The ICP-MS is useful for determining the origin of emeralds that are formed comparatively “locally” in geological stratus and when used with FT-IR and Mössbauer spectroscopy. The LA-ICP-MS technique uses a laser beam, which leaves a small crater of up to 200 microns on the surface of a gemstone, which vaporizes an extremely small sample of a gemstone. The ablated sample is carried by a stream of inert gas, usually argon, into a high-temperature field, causing the ionization of atoms and the dissociation of molecules. It is used for the:
- Detection of gemstone treatments
- Origin determination of gemstones
- Chemical analysis of corundum that can also detect Beryllium
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 10:30, 1 November 2009 | | 330 × 448 (21 KB) | Tim (talk | contribs) | LA-ICP-MS <br /> (Left side of photograph: ICP-MS, Right side of photograph: LA) <br /> Photo courtesy: Gübelin Gemmological Laboratory, Ltd <br /> <br /> The MS identifies and quantifies elements in terms of mass and charge and can detect 65 eleme |
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