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2020年9月1日—Singletstateisdefinedwhenalltheelectronspinsarepairedinthemolecularelectronicstateandtheelectronicenergylevelsdonotsplit ...

Understanding the difference between fluorescence and phosphorescence requires the knowledge of electron spin and the differences between singlet and triplet states. The Pauli Exclusion principle[1] states that two electrons in an atom cannot have the same four quantum numbers ((n), (l), (m_l), (m_s)) and only two electrons can occupy each orbital where they must have opposite spin states. These opposite spin states are called spin pairing. Because of this spin pairing, most molecules do not exhibit a magnetic field and are diamagnetic. In diamagnetic molecules, electrons are not attracted or repelled by the static electric field. Free radicals are paramagnetic because they contain unpaired electrons have magnetic moments that are attracted to the magnetic field.

Singlet state is defined when al...