Ionized by energetic starlight, a hydrogen atom emits the characteristic red H-alpha light as its single electron is recaptured and transitions to lower energy states.

氢原子被高能的恒星光离子化之后，在它的单个电子重新被捕获并跃迁到低能级上时会放出典型的红色h - alpha光。

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One can picture this single electron spin caught on the nanotube as an artificial atom, " says researcher from University of Copenhagen and participant in the study, Jonas Hauptmann.

人们也可以把被碳纳米管捕捉的单电子自旋当成一个人造的原子。” 哥本哈根大学研究员，这项研究的参与者，Jonas Hauptmann 说。

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Such ultra-precise clocks are based on the quick vibrations of a single aluminum ion, an atom that has lost one electron, held in a vacuum and confined by electromagnetic fields.

如此极其精确的时钟是建立在单一铝离子的快速振动，铝离子就是包含在真空中受电磁场约束的失去一个电子的原子。

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We're going to get to more complicated atoms eventually where we're going to have more than one electron in it, but when we're talking about a single electron atom, we know that the binding energy is equal to the negative of the Rydberg constant over n squared, so it's only depends on n.

我们以后会讲到，更加复杂的情况,那时候,不只有一个原子，但当我们讲，单个原子的时候，我们知道结合能，等于,负的Rydberg常数,除以n平方，所以它仅仅由n决定的。

麻省理工公开课 - 化学原理课程节选

So we can actually pop an electron or eject an electron from any single orbital that is occupied within the atom.

任何一个被占据轨道,打出一个电子,或者说发射出一个电子。

麻省理工公开课 - 化学原理课程节选

These are all one electron atoms, and they are gas, a single atom.

这些都是单电子原子，它们都是气体，都是单原子。

麻省理工公开课 - 固态化学导论课程节选

Hydrogen, the simplest atom, consists of a single proton encircled by a single electron.

ECONOMIST: Biochemistry