Precision Measurements In Few-electron Atoms And Molecules

Merkt, Frederic

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https://hdl.handle.net/2142/111382 Copy

Description

Title

Precision Measurements In Few-electron Atoms And Molecules

Author(s)

Merkt, Frederic

Issue Date

2021-06-23

Keyword(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).

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Permalink

http://hdl.handle.net/2142/111382

DOI

10.15278/isms.2021.WI01

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