/2 You can have it equal to plus 1/2, and that's what we call spin up, 1/2 or you can have it equal to minus 1/2, which is what we call spin down.

它可能会等于，我们叫它自选朝上，或者它等于负，我们叫它自旋朝下。

麻省理工公开课 - 化学原理课程节选

So what that means is that we're limited in any atom to having two electrons per orbital, right, because for any orbital we can either have a spin up electron, a spin down electron, or both.

这意味着在一个原子内,每个轨道上可以有两个电子，对吧，因为对任何轨道,我们可以有自旋向上或者自选向下或者两者都有。

麻省理工公开课 - 化学原理课程节选

And some of them might be spinning clockwise, in which case, according to the right-hand rule we would consider them spin-down.

而另一些电子则是在顺时针自旋，在这种情况下，根据右手定理,我们会以为它是在向下转。

麻省理工公开课 - 固态化学导论课程节选

Still, Motorola boxes currently lack spin down, although a spokesman says that could change next quarter.

FORBES: Magazine Article

Electrons are subatomic spinning tops: Spin up and spin down are the electron's version of clockwise and counterclockwise.

FORBES: Magazine Article

Another would be to slow a pulsar's spin down in pretty short order.

ECONOMIST: Pulsars