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We describe the first precision measurement of the electron's electric dipolemoment (eEDM, $d_e$) using trapped molecular ions, demonstrating theapplication of spin interrogation times over 700 ms to achieve high sensitivityand stringent rejection of systematic errors. Through electron spin resonancespectroscopy on $^{180}{\rm Hf}^{19}{\rm F}^{+}$ in its metastable$^{3}\Delta_{1}$ electronic state, we obtain $d_e = (0.9 \pm 7.7_{\rm stat} \pm1.7_{\rm syst}) \times 10^{-29}\,e\,{\rm cm}$, resulting in an upper bound of$|d_e| < 1.3 \times 10^{-28}\,e\,{\rm cm}$ (90% confidence). Our resultprovides independent confirmation of the current upper bound of $|d_e| < 9.3\times 10^{-29}\,e\,{\rm cm}$ [J. Baron $\textit{et al.}$, Science$\textbf{343}$, 269 (2014)], and offers the potential to improve on this limitin the near future.

A precision measurement of the electron's electric dipole moment using trapped molecular ions