Mass spectrometry

Lore & Background

J. J. Thomson later improved on Wien's work by reducing pressure to create the mass spectrograph. Modern techniques were devised by Arthur Jeffrey Dempster and F.W. Sector mass spectrometers called calutrons were developed by Ernest O. Lawrence and used for uranium isotope separation during the Manhattan Project at the Oak Ridge Y-12 plant. In 1989, half of the Nobel Prize in Physics was awarded to Hans Dehmelt and Wolfgang Paul for developing the ion trap technique in the 1950s and 1960s.

Reader's Guide

Mass spectrometry is a foundational analytical technique with broad significance. It allows identification of elements, isotopes, and molecular structures by measuring mass-to-charge ratios of ions. Its development spans over a century, from Goldstein's canal rays to modern ionization methods enabling analysis of large biomolecules like proteins. The technique's flexibility is evident in its five components—sample inlet, ion source, mass analyzer, detector, and data system—each independently variable. Applications range from pure samples to complex mixtures, including coupling with gas chromatography (GC-MS) or liquid chromatography (HPLC-MS). The calutron's role in uranium enrichment during the Manhattan Project highlights its historical impact. Nobel prizes awarded for ion trap and soft ionization techniques underscore its ongoing evolution. Mass spectrometry remains essential in chemistry, physics, biology, and medicine for precise compositional and structural analysis.

Did You Know?

• The term 'mass spectrograph' was used for early devices recording mass spectra on photographic plates.
• Calutron mass spectrometers were developed by Ernest O. Lawrence for uranium isotope separation during the Manhattan Project.
• Half of the 1989 Nobel Prize in Physics was awarded for the development of the ion trap technique in the 1950s and 1960s.