hole electron recombination

ion electron recombination

electron hole recombination

electron ion recombination

electron-ion recombination

recombination of ion and electron

electron electron interactions

electron electron scattering

electron-electron interaction

electron-electron interacton

electron-electron scattering

pi-electron (=π-electron)

strong electron-electron correlation

electron channeling contrast in scanning electron microscopy

electron gun for electron scrubbing

electron temperature and electron density

electron-hole liquid drop (=electron-hole droplet)

hard-electron (=high-energy electron)

inner electron (=inner-shell electron)