We study the resonances of a two-by-two semiclassical system of one dimensional Schradinger operators, near an energy where the two potentials intersect transversally, one of them being bonding, and the other one anti-bonding. Assuming that the interaction is a vector-field, we obtain optimal estimates on the location and on the widths of these resonances. (C) 2017 Elsevier Inc. All rights reserved.