# Thomas-forbidden particle capture 

John H. Carter ∗ and Michael Lieber 

Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701 

## Abstract 

At high energies, in particle-capture processes between ions and atoms, classical kinematic re- quirements show that generally double collision Thomas processes dominate. However, for certain mass-ratios these processes are kinematically forbidden. This paper explores the possibility of capture for such processes by triple or higher order collision processes. 

