但实际上我们也可以讨论氢原子，或者其它任何原子的其它能级的电离能。
But, in fact, we can also talk about the ionization energy of different states of the hydrogen atom or of any atom.
5500光年远处，猫爪星云是一个发射星云，红色来源于其丰富的电离状态的氢原子。
At 5, 500 light years distant, Cat's Paw is an emission nebula with a red color that originates from an abundance of ionized hydrogen atoms.
当所用激光辐射中的电场与氢原子中电子在基态所感受到的库仑场强度相当时会出现多光子电离现象。
The multiphoton ionization will happen when the electric field of lasers is equivalent to the Coulomb field in a hydrogen atom.
猫掌星云距离我们5,500光年，是一个发射星云，而那红光是大量被电离了的氢原子发出的。
At 5,500 light years distant, Cat's Paw is an emission nebula with a red color that originates from an abundance of ionized hydrogen atoms.
猫掌星云距离我们5,500光年，是一个发射星云，而那红光是大量被电离了的氢原子发出的。
At 5,500 light years distant, Cat's Paw is an emission nebula with a red color that originates from an abundance of ionized hydrogen atoms.
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