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 Title: Use Of Molecules To Search For New Physics And Study Properties Of The Nucleus. Author(s): Skripnikov, Leonid V. Subject(s): Mini-symposium: Precision Spectroscopy for Fundamental Physics Abstract: Molecular spectroscopy is one of the leading tools to search for the manifestation of New Physics. It can also provide accurate information about the nucleus properties, such as its magnetic moment. The existence of interactions that violate the combined CP-symmetry of fundamental interactions inside the nucleus can lead to a non-zero Schiff moment that corresponds to the electric field directed along with the nuclear spin. This moment is strongly enhanced in deformed nuclei. In molecules, an additional enhancement with respect to atoms occurs due to the existence of closely-lying opposite parity states. Using a combination of direct and two-step theoretical relativistic approaches, we study the electronic structure of heavy-atom molecules. We predict Schiff moment enhancement and other properties of $^{227}$AcF, $^{227}$AcN, $^{227}$AcO$^{+}$, $^{229}$ThO, $^{153}$EuO$^{+}$, and $^{153}$EuN molecules containing f-elements with deformed nuclei as well as the TlF molecule. It is shown that experiments with these molecules should be very sensitive to New Physics [1]. The developed theoretical methods are applied to related problems. One of them is the test of theoretical predictions of the molecular parameters used to interpret experiments to measure the electron electric dipole moment. For this, we study a hyperfine structure of a molecule. In this study, we consider the effect of the finite nuclear magnetization distribution. Usually, this effect is considered only in atoms, but it is demonstrated that it should be treated in precise studies of molecules [2]. Finally, we show how accurate molecular electronic structure's description can be used to solve the discrepancy between the theoretical and experimental data on the hyperfine structure of highly charged ions [3,4]. Research has been supported by the Russian Science Foundation Grant No. 19-72-10019. \\ 1. L.V. Skripnikov, N.S. Mosyagin, A.V. Titov, V.V. Flambaum, Phys. Chem. Chem. Phys., 22, 18374 (2020).\\ 2. L.V. Skripnikov, J. Chem. Phys. 153, 114114 (2020).\\ 3. L.V. Skripnikov, S. Schmidt, J. Ullmann, et al, Phys. Rev. Lett., 120, 093001 (2018).\\ 4. V. Fella, L.V. Skripnikov, W. Nörtershäuser, et al, M. Vogel, Phys. Rev. Res. 2, 013368 (2020).\\ Issue Date: 2021-06-24 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111344 DOI: 10.15278/isms.2021.RI03 Date Available in IDEALS: 2021-09-242022-01-21
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