Topical Issue on many particle spectroscopy of atoms, molecules, clusters and surfaces editorialKároly Tőkési, Béla Paripás, Gábor Pszota and Andrey V. Solov’yovEur. Phys. J. D, 75 2 (2021) 51DOI: https://doi.org/10.1140/epjd/s10053-021-00050-6