Speaker
Description
The accuracy of quantum electrodynamics tests in strong fields has been tested up to now by measuring transition energies in highly-charged ions, using accelerator facilities and ion sources (see, e.g., [1] and Refs. there in). New applications like atomic mass measurements with 10-11 relative accuracy, performed using advanced ion traps, require the evaluation of total binding energy differences between the ion measured and the neutral atom for which the total mass must be provided [2, 3]. Such accurate masses can be used in a variety of applications like the measurement of the neutrino mass. This high precision also allows to detect long-lived metastable with only a few tens of eV above the ground state [4]. In my talk I’ll describe the evaluation of mass differences between highly-charged ions and the corresponding neutral atom. I will also describe examples of metastable states that can be detected in ion traps and provide their lifetimes, including effects like hyperfine quenching [5], to see if one can hope measuring also their lifetimes in the trap. Such metastable states are usually the result of changes of level orders due to relativistic effects [6, 7]. Such metastable states could be the building blocks for future high-precision atomic clocks.
References
[1] Topical Review: QED tests with highly-charged ions, P. Indelicato. J. Phys. B 52, 232001 (2019).
[2] Mass-Difference Measurements on Heavy Nuclides with an eV/c2 Accuracy in the PENTATRAP Spectrometer, A. Rischka, H. Cakir, M. Door, P. Filianin, Z. Harman, W.J. Huang, P. Indelicato, C.H. Keitel, C.M. König, K. Kromer, M. Müller, Y.N. Novikov, R.X. Schüssler, C. Schweiger, S. Eliseev and K. Blaum. Phys. Rev. Lett. 124, 113001 (2020).
[3] Direct Q-Value Determination of the beta- Decay of 187Re, P. Filianin, C. Lyu, M. Door, K. Blaum, W.J. Huang, M. Haverkort, P. Indelicato, C.H. Keitel, K. Kromer, D. Lange, Y.N. Novikov, A. Rischka, R.X. Schüssler, C. Schweiger, S. Sturm, S. Ulmer, Z. Harman and S. Eliseev. Phys. Rev. Lett. 127, 072502 (2021).
[4] Detection of metastable electronic states by Penning trap mass spectrometry, R.X. Schüssler, H. Bekker, M. Braß, H. Cakir, J.R. Crespo López-Urrutia, M. Door, P. Filianin, Z. Harman, M.W. Haverkort, W.J. Huang, P. Indelicato, C.H. Keitel, C.M. König, K. Kromer, M. Müller, Y.N. Novikov, A. Rischka, C. Schweiger, S. Sturm, S. Ulmer, S. Eliseev and K. Blaum. Nature 581, 42-46 (2020).
[5] Effect of the hyperfine structure on the 2 3P1 and the 2 3P0 lifetime in heliumlike ions, P. Indelicato, F. Parente and R. Marrus. Phys. Rev. A 40, 3505-3514 (1989).
[6] Magnetic Dipole Line Predicted at 3193 Å from U LXXI Ground Term, U. Feldman, J. Sugar and P. Indelicato. J. Opt. Soc. of Am. B 8, 3-5 (1990).
[7] Hyperfine Quenching of the 3s23p63d4 J=4 level in titaniumlike ions, F. Parente, J.P. Marques and P. Indelicato. EPL 26, 437-442 (1994).
