利用物理方法确定带电粒子的化学组成,通常需要测定该带电粒子的荷质比q/m,当带电粒子为电子时,其荷质比记为e/m,对电子荷质比e/m的测定,中学阶段介绍了汤姆生原理: 让电子垂直进入匀强磁场,在洛仑兹力的作用 Using physical methods to determine the chemical composition of a charged particle, the charge-to-mass ratio q/m of the charged particle is usually measured. When the charged particle is electron, the charge-to-mass ratio is recorded as e/m, and the charge-to-mass ratio is e/m. Determination, the secondary school stage introduced Thomson’s principle: Let electrons enter the uniform magnetic field vertically, the role of Lorentz force