In the presence of a magnetic field, the atoms' orientation changed in a particular way, and this change was detectable in the light that came through the atom cloud, the team found.

小组发现，在磁场之中，原子的方向以特殊的方式发生的变化，而这种变化可以被穿过原子云的光束探测到。

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Well, laser flash that makes the atom glow while we - that this light that we use to image with, in the microscope.

我们不能像使用显微镜时，利用激光闪光，使得原子发光。

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A second of time, for instance, is now defined in terms of an electron transition of the cesium atom. And the meter is tied to the speed of light.

比如说，秒就是根据铯原子内部的电子跃迁时间来下的定义，而米的定义则和光速有关。

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If dark matter particles exist, scientists say, they should be able to observe a small amount of light given off when they hit the nucleus of a xenon atom.

VOA: special.2009.07.21

When struck by light, the electrons in an atom of silver vibrate in a way that causes them to radiate small amounts of light themselves.

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The principle behind these experiments is that particles hitting the xenon cause the nucleus of the atom to give off a little bit of light.

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"As humans we can identify galaxies light years away, we can study particles smaller than the atom, but we still haven't unlocked the mystery of the 3lb of matter that sits between our ears, " he said.

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