This form of radiation is often released when electrons transition from an unstable excited state, to a more stable state that has a lower energy. That's called the ground state.

这种辐射通常是在电子从不稳定的激到能量更低的稳定状时释放出来的，这个状称为基。

This form of radiation is often released when electrons transition from an unstable excited state, to a more stable state that has a lower energy.

这种辐射通常在电子从不稳定激到能量更低的更稳定状时释放。

Well, if it absorbs energy from a photon, electromagnetic radiation for example, it will jump to a higher level.

好吧，如果它从一个光子，比如电磁辐射中吸收能量，它就会到更高的能级。

Atoms can get to this state when they are themselves the products of radioactive decay, or if they get bombarded with radiation from other reactions pushing their electrons in to a higher energy level.

原子可以处于这种状，当它们自身是放射性衰变的产物，或者受到其他反应产生的辐射轰击，使它们的电子到更高的能级。