Question

$\huge[what\:is\:photoelectron?]$ ​

Answer 1

hi dear!

photoelectron is an electron emitted from an atom by interaction with a photon, especially an electron emitted from a solid surface by the action of light.

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Answer 2

Answer:

Definition: An electron emitted from an atom by interaction with a photon, especially an electron emitted from a solid surface by the action of light.

Explanation:

Photoelectrons are those electrons which are produced when an energetic photon of radiation strikes a molecule, and the analysis of the spectrum of energies which they possess gives rise to the photoelectron spectrum. Since electrons are in general fairly firmly bound within molecules, the exciting radiation must be in the UV region of the spectrum, even when peripheral, or valence shell, electrons are ejected. For the lower-lying core electrons still more energetic radiation is needed, and for this purpose X-rays are used. Thus two main types of PE spectroscopy can be defined: UPS or ultraviolet photoelectron spectroscopy, which probes the valence shell electrons, and XPS or X-ray photoelectron spectroscopy, which is mainly concerned with the low-lying core electrons. The latter type is also known as ESCA, which stands for electron spectroscopy for chemical analysis. It is useful for this purpose (chemical analysis) because the energies of the core electrons are very characteristic of the atoms from which they arise, regardless of their chemical combination. It is UPS that provides the results of greatest interest to the heterocyclic chemist. 

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