起始粒子数反转的英文 起始粒子数反转用英语怎么说

"起始粒子数反转" can be translated as "initial population inversion" in English.

Here, "initial" refers to the starting point or the beginning state, while "population inversion" is a term commonly used in physics, particularly in the context of lasers and quantum optics, to describe a situation where more particles are in an excited state than in a lower-energy state.