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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.
Jablonski diagram indicating intersystem crossing (left) and internal conversion (right). Internal conversion is a transition from a higher to a lower electronic state in a molecule or atom. [ 1 ] It is sometimes called "radiationless de-excitation", because no photons are emitted.
Which is it then: "Intersystem crossing is a radiationless process involving a..." vs "The radiative decay /.../ phosphorescence is another manifestation of intersystem crossing"? — Preceding unsigned comment added by 84.250.10.117 ( talk ) 15:01, 20 January 2013 (UTC) [ reply ]
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.
Both Mekong and the distributary Bassac then flow towards the Cambodia–Vietnam border. After entering Vietnam, Mekong is known as the Tiền River (or Fleuve Antérieur in French, meaning "prior river") while Bassac is known as the Hậu River (Vietnamese: Sông Hậu/ Hậu Giang or French: Fleuve Postérieur, meaning "posterior river"). [2]
The Vietnamese Wikipedia initially went online in November 2002, with a front page and an article about the Internet Society.The project received little attention and did not begin to receive significant contributions until it was "restarted" in October 2003 [3] and the newer, Unicode-capable MediaWiki software was installed soon after.
The border crossing between Hekou (foreground) and Lao Cai (background) China and Vietnam signed an agreement on border trade in 1991. In 1992, 21 border trade points (cross border markets and goods import/export but limited through access for people) were opened, of which four also served as border crossings. [29]