制造伽马射线短脉冲的一种方法，是电子与正电子的碰撞——之后的湮灭，使粒子的质量转化为能量。
One way to create such short bursts of gamma rays is through the collision — and subsequent annihilation, as the mass of those particles converts into energy — of an electron and a positron.
该现象是由薄膜中金属超微粒子内费米能级附近电子被飞秒激光脉冲激发所产生的非平衡态电子经历瞬态弛豫造成的。
The optical relaxation is a process in which nonequilibrium electrons, excited by laser pulses and originating from near Fermi level in Cu ultrafine particles, return to the equilibrium state.
出于脉冲星中粒子加速问题，讨论外电场中注入的正负电子对静电不稳定性。
Motivated by the particle acceleration problem in pulsars, it is numerically investigated for electrostatic instability of electron-positron pairs injected in an external electric field.
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