41.00.00 Electromagnetism; electron and ion optics
- 41.20.-q Applied classical electromagnetism (for submillimeter wave, microwave, and radiowave instruments and equipment, see 07.57.-c)
- 41.50.+h X-ray beam source magnets and x-ray optics for control of particle beams (see also 07.85.Fv X- and gamma-ray sources, mirrors, gratings, and detectors in instruments)
- 41.60.-m Radiation by moving charges (2)
- 41.75.-i Charged-particle beams (1)
- 41.85.-p Beam optics (see also 07.77.Ka Charged-particle beam sources and detectors in instruments; 29.27.-a Beams in particle accelerators) (2)
- 41.90.+e Other topics in electromagnetism; electron and ion optics (restricted to new topics in section 41)