Fragment libraries molecule sources

Electron ionization occurs when an electron beam crosses an ion source (box) and interacts with sample molecules that have been vaporized into the source. Where the electrons and sample molecules interact, ions are formed, representing intact sample molecular ions and also fragments produced from them. These molecular and fragment ions compose the mass spectrum, which is a correlation of ion mass and its abundance. El spectra of tens of thousands of substances have been recorded and form the basis of spectral libraries, available either in book form or stored in computer memory banks. 

Use of a triple quadrupole mass spectrometer with ES-source opens up additional possibilities for the characterization of libraries. The parent ion scan can be used if all compounds of a library form the same fragment ion. In addition, the neutral loss experiment allows the detection of all molecules undergoing the same mass loss. In both cases the adequate fragmentation of library compounds must be ensured by the appropriate choice of... 

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