Electron mass without B-field: best precision?

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  • Thread starter Thread starter Roberto Pavani
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Roberto Pavani
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TL;DR
What is the most precise determination of the electron mass (or ##e/m_e##) that does not rely on a magnetic field?
The CODATA value of ##e/m_e## comes from Penning-trap cyclotron frequency measurements (strong ##B## field). Are there any competitive determinations of the same ratio ##e/m_e## using purely electric methods (no ##B##)? For instance from LINAC kinematics or Duane-Hunt bremsstrahlung? The papers I found have precisions of only 2–10%. Is there anything better?
 

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