Abstract
A recently derived modified version of the Firsov model to account for the low-energy electronic stopping cross section of protons due to molecular targets is extended here for the case of heavy projectiles. The method is free of adjustable parameters and is applied to projectiles with 2 ≤ Z ≤ 18 incident on a wide class of hydrocarbon materials and other simpler molecules. A fair overall agreement is observed with available experimental data for He and Li projectiles. The use of characteristic molecular groups as well as the core and bond (CAB) formalism for stopping power studies of heavy ions in compound materials is strongly supported by the results of this work.
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