Electrons are caused to bombard {HEAD ~ the surface} of the solid material, transferring their energy to the atoms/molecules comprising the source material and resulting in {TAIL ~ sublimation} 
resulting in
Electrons are caused to bombard { HEAD ~ the surface } of the solid material , transferring their energy to the atoms / molecules comprising the source material and resulting in { TAIL ~ sublimation }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL