Doubly differential cross sections for ionization of lithium atom by protons and O8+^{8+} ions

We consider single ionization of lithium atom in collisions with $p$ and O$^{8+}$ projectiles. Doubly differential cross sections for ionization are calculated within a relativistic non-perturbative approach. Comparisons with the recent measurements and theoretical predictions are made.Comment: Submitted to the Topical Issue of Eur. Phys. J. D based on the contributions reported on the International Conference on Many Particle Spectroscopy of Atoms, Molecules, Clusters and Surfaces (MPS 2018), Budapest, Hungary, 21-24 August 201