What is the principal of it spectroscopy, what is operator , role of core electrons .

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Spectroscopy is the study of the interaction between matter and electromagnetic radiation. Operators are mathematical functions used to describe the behavior of particles. Core electrons play a crucial role in determining the electronic structure of atoms and molecules.

Spectroscopy involves the measurement of the absorption, emission, or scattering of electromagnetic radiation by matter.
Operators are used in quantum mechanics to describe the behavior of particles and their interactions with electromagnetic fields.
Core electrons are the electrons in an atom that are not involved in chemical bonding and are located in the innermost shells.
The behavior of core electrons can have a significant impact on the electronic structure of atoms and molecules.
Examples of spectroscopy techniques include infrared spectroscopy, UV-Vis spectroscopy, and nuclear magnetic resonance spectroscopy.

What is the principal of it spectroscopy, what is operator , role of core electrons .

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