University of Cambridge > > Cavendish Physical Society > “Precision Mass Measurement: ωcyclotron is not qB/m, does E=mc2?”

“Precision Mass Measurement: ωcyclotron is not qB/m, does E=mc2?”

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We have developed an ion balance that has improved atomic and molecular mass measurement accuracy beyond 10-11. It compares the cyclotron frequency of two individual molecular or atomic ions trapped in a uniform magnetic field to find the mass ratio. Besides improving the mass of fundamental particles, we have discovered a correction to the cyclotron resonance formula, enabled a new route to determining the fine structure constant using simple physics, made the best measurement of the dipole moment of any charged molecule, recalibrated the x-ray wavelength standard, enabled a possible route to replace the artifact kilogram with an atomic mass standard, and made a precise test of E=mc2. We can also weigh chemical bonds.

This talk is part of the Cavendish Physical Society series.

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