Rotational spectroscopy
Microwave spectroscopy
Quizzed article REF: P2875 V2
Rotational spectroscopy
Microwave spectroscopy

Author : Annunziata SAVOIA

Publication date: August 10, 2021, Review date: August 30, 2021 | Lire en français

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1. Rotational spectroscopy

Spectroscopy uses the emission, absorption, and scattering of electromagnetic radiation to study atoms or molecules. Emission occurs when an atom or molecule loses energy by radiating light. Absorption is the reverse process.

In the case of scattering, electromagnetic radiation is deflected from its path when it interacts with matter. This interaction is different in nature from that observed and studied in emission and absorption spectroscopy and will not be discussed here.

The emission or absorption of electromagnetic radiation by matter can only occur at frequencies specific to that matter. The set of transitions observed between energy levels constitutes the spectrum of the system under study.

It represents, in a way, a characteristic fingerprint of the species under...

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