When it comes to synonyms for the term "atomic beam", there are quite a few words one can use. Some of the most popular ones include "laser beam", "particle beam", "radiation beam", and "ion beam". All of these terms refer to a concentrated stream of particles or waves that are typically emitted by an atomic or subatomic source. Each term can be used in a slightly different context depending on the specific situation or field of study, but in general, they all describe a highly-focused beam of energy that is used in a range of applications, from scientific research to medical treatments and industrial processes.