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NEWS

Prof. Guenter Werth

Johannes-Gutenberg-University, Mainz, Germany

Monday, July 15th, 2013 at 11:00:00 AM  

Conference room Querzoli - LENS - via Nello Carrara 1 - Sesto Fiorentino (Florence)

Published on-line at 11:32:36 AM on Wednesday, July 10th, 2013

A new value for the atomic mass of the electron

A new value for the electron's mass, almost one order of magnitude more precise than the present value.

We use single particles confined in a Penning trap to measure the magnetic moment (g-factor) of the electron bound in hydrogen-like ions. The results for several ion species represent to date the most stringent test of bound-state quantum electrodynamics calculations.

Most recently we performed (so far unpublished) measurements on C5+ and obtained an uncertainty of a few parts in 1011. From a comparison to accurate calculations we obtained a new value for the electron's mass which is more than one order of magnitude more precise than the present value.

For further informations, please contact Dr. Nicole Fabbri.