| 释义 |
Thomson parabolas Thomson parabolas[′täm·sən pə′rab·ə·ləz] (electromagnetism) A pattern of parabolas which appear on a photographic plate exposed to a beam of ions of an element which has passed through electric and magnetic fields applied in the same direction normal to the path of the ions; each parabola corresponds to a different charge-to-mass ratio, and thus to a different isotope. |