Observation of theg−2Resonance of a Stored Electron Gas Using a Bolometric Technique

A bolometric technique is used to determine the $g$-factor anomaly $a$ of the free electron from measurements made on 78°K electrons contained in a Penning-style quadrupole ion trap. The value obtained is $a=0.001\mathrm{}159667\left(24\right)\mathrm{}$, where the electron $g$ factor is given by $g=2\mathrm{}(1+a)\mathrm{}$.