In fact, any transition can absorb light energy, but in different areas. The rotation and libration of molecules absorb microwave and far-infrared light. For example, the libration of water is in the far-infrared 834 cm 1;. Not a bad question. Indeed, for an energy level difference, if one photon is absorbed, the calculation method is δ e = h ν \delta e=h\nu However, why can it absorb many wavelengths? This is because: there will be different degrees of freedom, different keys. Partial refers to the content contained in a sound, which is not necessarily an integer multiple of the fundamental frequency. Harmonic is a member of the harmonic sequence, that is to say, it is an integer multiple of the fundamental frequency. Any partial above the lowest order partial overtone [1] harmonic.
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