noun: the act (or an instance) of subjecting a body or substance to the impact of high-energy particles (as electrons or alpha rays) http://www.onelook.com/
noun: heat electrodes of electron tubes to drive out gases during evacuation. http://www.answers.com/topic/bombardment See radioluminescence
"He (Keely) states he found the electric stream to be as free from percussion (bombardment) as an infant's breath, for "the three streams flow together as one in the mildest ways." [INTERATOMIC BOMBARDMENT]
Bombardment is also the receptive mode of the Law of Force.