莱曼极限是氢的莱曼系最短的波长，结束在91.2奈米。它相当于一个电子从氢的基态逃逸到电位势障壁所需要的能量，也就是创造一个氢离子。这个能量等同于里德伯常量。

• 莱曼α发射体
• 莱曼α森林
• 莱曼断裂星系
• 里德伯公式

The Lyman limit is the short-wavelength end of the hydrogen Lyman series, at 91.2 nm (912 Å). It corresponds to the energy required for an electron in the hydrogen ground state to escape from the electric potential barrier that originally confined it, thus creating a hydrogen ion. This energy is equivalent to the Rydberg constant.