Field Desorption Mass Spectroscopy (FS-MS)

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Summary

Field desorption (FD) is a technique for achieving ionization by drawing electrons out of the sample particles in a high electrical field. Under the FD method, compared with electron ionization (EI), fragmentation does not readily take place, and molecular ions (ions from whose molecules one molecule has come off) can be observed. For this reason, the use of the FD method makes it possible to accurately estimate the molecular weight.
Furthermore, it is also possible by use of the FD method to infer the elemental composition from the isotopic ratio and the molecular structure by combining FD with EI.
An advantage of the FD method lies in the analysis of refractory compounds and thermolabile compounds. The determination range is m/z 2000 or so. A trace amount (several mg) of a sample can be measured.

Example of analysis: Analysis of Tinuvin 326

A strong peak was detected at m/z 315.1.
This peak is presumed to be molecular ions of Tinuvin 326.
Further, fragment ions (that are observed on the side of lower molecular weight than that of molecular ions) were not observed.

FD-MS analysis makes the observation of molecular ions easy and is effective in presuming the molecular formula of compounds.

Search Number 2001

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