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

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• Professor Dave Pritchard, Cecil and Ida Green Professor of Physics, MIT
• Wednesday 07 November 2012, 16:00-17:00
• Pippard Lecture Theatre, Cavendish Laboratory.

If you have a question about this talk, please contact Leona Hope-Coles.

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.

This talk is included in these lists:

• All Cavendish Laboratory Seminars
• All Talks (aka the CURE list)
• Cavendish Physical Society
• Centre for Health Leadership and Enterprise
• Cosmology, Astrophysics and General Relativity
• Featured lists
• Hanchen DaDaDash
• Inference Group Summary
• ME Seminar
• NanoDTC Energy Materials Talks
• NanoDTC Talks
• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
• Pippard Lecture Theatre, Cavendish Laboratory
• School of Physical Sciences
• Thin Film Magnetic Talks

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