1. Rotation spectroscopy
Spectroscopy exploits the emission, absorption and scattering of electromagnetic radiation to study atoms and molecules. Emission occurs when an atom or molecule loses energy by radiating light. Absorption is the opposite process.
In the case of scattering, electromagnetic radiation is deflected from its trajectory when it interacts with matter. This is a different kind of interaction from that observed and studied in emission and absorption spectroscopy, and will not be dealt with here.
The emission or absorption of electromagnetic radiation by matter can only occur at frequencies specific to it. The set of transitions observed between energy levels constitutes the spectrum of the system under study.
In a way, it represents a characteristic fingerprint of the species under...
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Rotation spectroscopy
Fourier transform microwave pulse spectrometer FTMW
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