Back-Scattered Electrons (BSEs) The incident electrons from the primary beam elastically scattered back by the sample's atoms with very little energy loss (less than 1 eV). ⊙ IE BSE L K ⊙ 9Back-Scattered Electrons (BSEs) • The incident electrons from the primary beam elastically scattered back by the sample's atoms with very little energy loss (less than 1 eV). 9