Topical Issue on many particle spectroscopy of atoms, molecules, clusters and surfaces editorial Károly Tőkési, Béla Paripás, Gábor Pszota and Andrey V. Solov’yov Eur. Phys. J. D, 75 2 (2021) 51 Published online: 08 February 2021 DOI: 10.1140/epjd/s10053-021-00050-6