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Leonardo S. Santos, "Reactive Intermediates: MS Investigations in Solution"

Mass spectrometry could be described, without implying any criticism, as an

example of work in progress. Each time it appears to be approaching maturity,

another breakthrough occurs to expand its usefulness in new areas of science. As

this volume clearly demonstrates, that process is still going on. In the early twentieth

century, mass spectrometry was principally a tool for physicists to study particles

and petroleum chemists to characterize petroleum mixtures.Wider use by chemists

began with the ability to obtain structural information from the spectra of pure

organic molecules. The analytical application of mass spectrometry truly came of age

with its use as a detector for gas chromatography. Indeed, up to the present, advances

in chromatography and mass spectrometry have leapfrogged each other, combining

to create analytical tools that have steadily advanced in selectivity and detection limit

for over two decades. The power of these tools is such that they have found critical

applications in virtually every area of science, engineering, and medicine.

From the standpoint of mass spectrometric instrumentation, the story of this

evolution has taken place on four fronts:

(1) Methods of separating ions of different atomic or molecular masses

(2) Methods of obtaining more chemical information by tandem mass spectrometry

(3) Methods of ionizing analyte molecules

(4) Methods that improve sensitivity and throughput.

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