Penning-trap eigenfrequency measurements with optical radiofrequency detectors Berrocal Sánchez, Joaquín Hernández, A. Arrazola, I. Domínguez González, Francisco Carrasco Sanz, Ana Fernández Baldomero, Francisco J. Block, M. Rodríguez Rubiales, Daniel We use an electric-dipole laser-driven transition to precisely measure the cyclotron-frequency ratios of the pairs 42Ca+−40Ca+, 44Ca+−40Ca+, and 48Ca+−40Ca+ in a 7-tesla Penning trap. A single laser-cooled (T≈1 mK) ion serves, together with photon-counting and photon-imaging units, as a radiofrequency detector covering a broadband frequency spectrum, in the present case from kHz to a few MHz. Such detectors (40,42,44,48Ca+) allow measuring extremely small forces increasing the sensitivity in Penning-trap mass spectrometry. The direct determination of the ions' amplitudes makes a cyclotron-frequency measurement process more robust against inhomogeneities of the magnetic field and/or deviations of the electric quadrupole field due to mechanical imperfections of the trap. 2024-05-03T07:55:27Z 2024-05-03T07:55:27Z 2024-01-03 journal article J. Berrocal, A. Hernández, I. Arrazola, F. Domínguez, A. Carrasco-Sanz, F. J. Fernández, M. Block, and D. Rodríguez. Penning-trap eigenfrequency measurements with optical radiofrequency detectors. Phys. Rev. Research 6, L012001 (2024) [10.1103/PhysRevResearch.6.L012001] https://hdl.handle.net/10481/91350 10.1103/PhysRevResearch.6.L012001 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional American Physical Society