Ionization energies and structures of small lanthanum oxide clusters (La2O3)n.LaO (n = 1–3) Soumen Bhattacharyya, Prasenjit Sen, Sheo Mukund, Suresh Yarlagadda, Debashis Bandyopadhyay and Sanjay G. Nakhate Eur. Phys. J. D, 73 7 (2019) 158 Published online: 25 July 2019 DOI: 10.1140/epjd/e2019-100185-5