#particle_beam  a collimated flow of particles (atoms or electrons or molecules)
  supertype:  #electron_beam__beam__ray  a group of nearly parallel lines of electromagnetic radiation
  subtype:  #ion_beam__ionbeam__inoic_beam__inoicbeam  a beam of ions moving in the same direction at the same speed

No statement uses or specializes #particle_beam; click here to add one.