Hyphenated techniques are obtained when two different types of instruments are mated together. The names of these techniques are constructed from the names of the instruments interfaced and be then adding a hyphen. For example, the technique that interfaces a gas chromatograph to a mass spectrometer is called gas chromatography-mass spectrometry, or GC-MS for short. The purpose of hyphenated techniques is to allow multiple pieces of information to be obtained on the same sample by having two or more instruments working together. In GC-MS the gas chromatograph puri€es the sample into its components and can quantify those components, and the MS identi€es each component. This provides a powerful technique for purifying, identifying, and quantifying mixtures. Hyphenated infrared techniques make use of the ability of FTIR to provide chemical information. Frequently, FTIRs are interfaced to instruments that provide physical information to give hyphenated techniques that provide physical and chemical information on the same sample.