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 Title: Precision Measurements In Few-electron Atoms And Molecules Author(s): Merkt, Frederic Subject(s): Mini-symposium: Precision Spectroscopy for Fundamental Physics Abstract: Few-electron molecules are attractive systems for precision spectroscopy because their properties can be calculated with high accuracy by quantum-chemical methods (1-5). The measurements serve to test theoretical predictions, ideally at the level where their accuracy is limited by the uncertainties of the fundamental constants or by unrecognized physical effects. I will report on precision measurements of energy intervals in cold samples of He, H$_2$ and He$_2$. In particular, we determine their ionization energies with a precision ($\Delta\nu/\nu$) of 10$^{-10}$ from high-resolution Rydberg spectra (6-8), approaching the level where uncertainties in the size of the nuclei and the nuclear-to-electron mass ratios would limit the accuracy of otherwise exact calculations and calibration requires the use of primary frequency standards. Comparison will be made to recent theoretical results in the context of more-than-100-year-long experimental and theoretical efforts invested in the accurate determination of the properties of fundamental few-electron atoms and molecules. 1.V. I. Korobov, L. Hilico and J.-P. Karr, Phys. Rev. Lett. 118, 23, 001 (2017). 2.M. Puchalski, J. Komasa, P. Czachorowski, and K. Pachucki, Phys. Rev. Lett. 122, 103003 (2019). 3.D. Ferenc, V. I. Korobov and E. Mátyus, Phys. Rev. Lett. 125, 213001 (2020). 4.V. A. Yerokhin, V. Patkóš, M. Puchalski, and K. Pachucki, Phys. Rev. A 102, 012807 (2020) 5.P. Danev, D. Balakov, V. I. Korobov, S. Schiller, Phys. Rev. A 103, 012805 (2021) 6.M. Beyer, N. Hölsch, J. A. Agner, J. Deiglmayr, H. Schmutz and F. Merkt, Phys. Rev. A 97, 012501 (2018). 7.N. Hölsch, M. Beyer, E. J. Salumbides, K. S. E. Eikema, W. Ubachs, Ch. Jungen, and F. Merkt, Phys. Rev. Lett. 122, 103002 (2019). 8.L. Semeria, P. Jansen, G.-M. Camenisch, F. Mellini, H. Schmutz, and F. Merkt, Phys. Rev. Lett. 124, 213001 (2020). Issue Date: 2021-06-23 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111382 Date Available in IDEALS: 2021-09-24
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