Topical Issue on atomic cluster collisions Alexey Verkhovtsev, Germán Rojas-Lorenzo, Jesús Rubayo-Soneira and Andrey V. Solov’yov Eur. Phys. J. D, 73 7 (2019) 154 Published online: 25 July 2019 DOI: 10.1140/epjd/e2019-100262-9