即使只相差一个原子的分子也会有差别很大的振动。
Even molecules that differ by a single atom can vibrate quite differently.
化学家们早就知道，在分子中原子以特定的取决于整体分子结构的频率振动。
Chemists have long known that atoms in a molecule vibrate at a particular frequency, depending on their overall molecular structure.
激光与鉴定对象的电子相互作用，使原子振动并使激光光子的能量上下变化。
The laser light interacts with the object’s electrons, making the atoms vibrate and shifting the energy of the laser photons up or down.
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