Two-electron exchange interaction between polar molecules and atomic ions – Asymptotic approach Oleksandr M. Karbovanets, Myroslav I. Karbovanets, Mykhaylo V. Khoma and Volodymyr Yu. Lazur Eur. Phys. J. D, 69 4 (2015) 94 Published online: 02 April 2015 DOI: 10.1140/epjd/e2015-50784-5