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infrared multiphoton dissociation
Infrared multiphoton dissociation (IRMPD) is a technique used in mass spectrometry to fragment molecules in the gas phase usually for structural analysis of the original (parent) molecule.
== How it works ==
An infrared laser is directed through a window into the vacuum of the mass spectrometer where the ions are. The mechanism of fragmentation involves the absorption by a given ion of multiple infrared photons. The parent ion becomes excited into more energetic vibrational states until a bond(s) is broken resulting in gas phase fragments of the parent ion. In the case of powerful laser pulses, the dissociation proceeds via inner-valence ionization of electrons.
IRMPD is most often used in Fourier transform ion cyclotron resonance mass spectrometry.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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