Hans Georg Dehmelt

Hans Georg Dehmelt was a German-American physicist who shared the 1989 Nobel Prize in Physics for developing methods to trap and study individual ions.

Penning trap: A device that confines charged particles using a magnetic field and an electrostatic field. Dehmelt used this trap to store ions for extended measurements.
Electron magnetic moment: A measure of the strength and orientation of the magnetic dipole associated with an electron. Dehmelt’s trapped-electron experiments measured this quantity with exceptional precision.
Wolfgang Paul: A German physicist who developed the quadrupole ion trap and shared the 1989 Nobel Prize in Physics. Paul’s trap provided a key method that Dehmelt adapted for individual ions.
University of Göttingen: A German public research university founded in 1737, historically prominent in mathematics and the sciences. Dehmelt earned his doctorate in physics there in 1949.
Paul trap: A device that confines charged particles with oscillating electric fields. Dehmelt adapted Paul’s trapping method to isolate single ions.
Anomalous magnetic dipole moment: The difference between a particle’s measured magnetic moment and its Dirac-theory value. Trapped electrons allowed Dehmelt to test this subtle quantum-electrodynamic correction.
Norman Foster Ramsey Jr.: An American physicist who developed separated oscillatory fields and shared the 1989 Nobel Prize in Physics. Ramsey shared the prize with Dehmelt and Paul for precision methods in atomic physics.
World War II: A global war fought from 1939 to 1945 between the Axis powers and the Allies. Dehmelt’s university studies were interrupted by military service during the war.
Ion trapping: The confinement of ions using electromagnetic fields so they can be studied or manipulated. Dehmelt’s work helped establish ion trapping as a precision-measurement technique.
Electron: A negatively charged elementary particle that is a constituent of atoms and carries spin one-half. The electron was the principal particle in Dehmelt’s precision-trapping experiments.

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