Can Raman spectra be obtained from solids, liquids and gases?

Raman spectra can be acquired from nearly all samples which contain true molecular bonding.  This means that solids, powders, slurries, liquids, gels and gases can be analysed using Raman spectroscopy.  However, in general metals and alloys cannot be analysed using Raman.

Although gases can be analysed using Raman spectroscopy, the concentration of molecules in a gas is typically very low, so the measurement is often more challenging.  Usually specialised equipment such as higher powered lasers and long pathlength sample cells are necessary.  In some cases where gas pressures are high (such as gas inclusions in minerals) standard Raman instrumentation can easily be used.

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