text: Raman spectroscopy is similar to FTIR in using a focused laser on the glass phase of the melt inclusion or a vapor bubble that may be contained in the melt inclusion to identify wavelengths associated with the Raman vibrating bands of volatiles, such as HO and CO. Raman spectroscopy can also be used to determine the density of CO contained in a vapor bubble if present at a high enough concentration within a melt inclusion.