Question

5. When atoms/ions are de-excite
automatically from higher energy
state to lower energy state is called?

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Answer 1

Answer:

The excitation of a system (an atom or molecule) from one excited state to a higher energy excited state with the absorption of a photon is called excited state absorption (ESA). Excited state absorption is possible only when an electron has been already excited from the ground state to a lower excited state.

Explanation:

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