Charge Exchange and Energy Loss of Slow Highly Charged Ions in 1nm Thick Carbon Nanomembranes

摘要

Experimental charge exchange and energy loss data for the transmission ofslow highly charged Xe ions through ultra-thin polymeric carbon membranes arepresented. Surprisingly, two distinct exit charge state distributionsaccompanied by charge exchange dependent energy losses are observed. The energyloss for ions exhibiting large charge loss shows a quadratic dependency on theincident charge state indicating that equilibrium stopping force values do notapply in this case. Additional angle resolved transmission measurements pointon a significant contribution of elastic energy loss. The observations showthat regimes of different impact parameters can be separated and thus aparticle's energy deposition in an ultra-thin solid target may not be describedin terms of an averaged energy loss per unit length.