Speaker
Description
The hydrogen molecular ions H2+ and HD+ are promising systems for fundamental constants metrology. Their spectrum offer many ultra-narrow ro-vibrational transitions, the frequencies of which are sensitive to the proton-electron mass ratio, proton charge radius, and Rydberg constant [1]. Several projects aiming at high-accuracy measurements using Doppler-free spectroscopy schemes [2-4] are in progress.
The interpretation of experimental data requires improved theoretical description of the hyperfine structure [4]. The leading terms of the hyperfine Hamiltonian, i.e. the spin-spin Fermi contact interactions, have been calculated with high precision [5], but the theoretical accuracy is limited by the spin-orbit and spin-spin tensor interactions, which have been so far evaluated in the framework of the Breit-Pauli Hamiltonian [6,7]. The calculation of higher-order relativistic corrections to these interaction terms, following the NRQED approach, will be presented.
[1] J.-Ph. Karr, L. Hilico, J.C.J. Koelemeij, V.I. Korobov, Phys. Rev. A 94, 050501(R) (2016).
[2] L. Hilico, N. Billy, B. Grémaud, D. Delande, J. Phys. B 34, 491 (2001).
[3] V.Q. Tran, J.-Ph. Karr, A. Douillet, J.C.J. Koelemeij, L. Hilico, Phys. Rev. A 88, 033421 (2013).
[4] S. Alighanbari, M.G. Hansen, V.I. Korobov, S. Schiller, Nature Phys. 14, 555 (2018).
[5] V.I. Korobov, J.C.J. Koelemeij, L. Hilico, J.-Ph. Karr, Phys. Rev. Lett. 116, 053003 (2016).
[6] D. Bakalov, V.I. Korobov, S. Schiller, Phys. Rev. Lett. 97, 243001 (2006).
[7] V.I. Korobov, L. Hilico, J.-Ph. Karr, Phys. Rev. A 74, 040502(R) (2006).
