There are multiple methods of mass spectrometry and ionization. However, most of these methods are not suitable for organometallic/elementorganic samples, since inert application methods and soft ionization are usually necessary. In these cases, the liquid injection field desorption ionization mass spectrometry (LIFDI-MS) method has proven effective. Samples are introduced through a capillary from a sealed vial with a septum, and the ionization method itself is one of the softest available. For more information on LIFDI-MS I recommend reading this website (external link).

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