arXiv:1002.3617v1 [physics.atom-ph] 18 Feb 2010 Thomas-forbidden particle capture John H. Carter ∗ and Michael Lieber Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701 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. Abstract ∗ Present address: Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, MO 65897 1