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Intersystem crossing (ISC) is an isoenergetic radiationless process involving a transition between the two electronic states with different spin multiplicity. [ 1 ] Excited electrons can undergo intersystem crossing to a degenerate state with a different spin multiplicity.
A Jablonski diagram showing the excitation of molecule A to its singlet excited state (1 A*) followed by intersystem crossing to the triplet state (3 A) that relaxes to the ground state by phosphorescence. It was used to describe absorption and emission of light by fluorescents.
It differs from intersystem crossing in that, while both are radiationless methods of de-excitation, the molecular spin state for internal conversion remains the same, whereas it changes for intersystem crossing. The energy of the electronically excited state is given off to vibrational modes of the molecule.
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Singlet fission is a spin-allowed process, unique to molecular photophysics, whereby one singlet excited state is converted into two triplet states.The phenomenon has been observed in molecular crystals, aggregates, disordered thin films, and covalently-linked dimers, where the chromophores are oriented such that the electronic coupling between singlet and the double triplet states is large.
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On Bastille Day, 14 July, the task force took to the road, and two days later at dusk, the various units had reached Ea H'leo. [6] The French having learned some of the lessons from Mang Yang Pass had prepared themselves in case of another ambush - the artillery were pushed up to support the front units, while infantry units and vehicles established temporary defensive positions.
This file is a government work by either the government of the French protectorate of Tonkin, the French protectorate of Annam, the colony of Cochinchina, the Autonomous Republic of Cochinchina, the Republic of Southern Vietnam, the Provisional Central Government of Vietnam, the State of Vietnam, the First Republic of Vietnam, or the Second ...