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  2. Intersystem crossing - Wikipedia

    en.wikipedia.org/wiki/Intersystem_crossing

    For Fe(II) complexes, the first intersystem crossing occurs from the singlet to the triplet state, which is then followed by intersystem crossing between the triplet and the quintet state. At low temperatures, the low-spin state is favored, but the quintet state is unable to relax back to the low-spin ground state due to their differences in ...

  3. Triplet-triplet annihilation - Wikipedia

    en.wikipedia.org/wiki/Triplet-Triplet_Annihilation

    The energy of the first triplet excited state (T 1) is transferred to a second triplet excited state (T 1), resulting in (1) the first T 1 returning to the singlet ground state S0 and (2) the second T 1 promoting to the singlet excited state (S 1). Triplet-triplet annihilation (TTA) is an energy transfer mechanism where two molecules in their ...

  4. Jablonski diagram - Wikipedia

    en.wikipedia.org/wiki/Jablonski_diagram

    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 fluorescence.

  5. Triplet state - Wikipedia

    en.wikipedia.org/wiki/Triplet_state

    Examples of atoms in singlet, doublet, and triplet states. In quantum mechanics, a triplet state, or spin triplet, is the quantum state of an object such as an electron, atom, or molecule, having a quantum spin S = 1. It has three allowed values of the spin's projection along a given axis m S = −1, 0, or +1, giving the name "triplet".

  6. Singlet state - Wikipedia

    en.wikipedia.org/wiki/Singlet_state

    The ability of positronium to form both singlet and triplet states is described mathematically by saying that the product of two doublet representations (meaning the electron and positron, which are both spin-1/2 doublets) can be decomposed into the sum of an adjoint representation (the triplet or spin 1 state) and a trivial representation (the ...

  7. Singlet oxygen - Wikipedia

    en.wikipedia.org/wiki/Singlet_oxygen

    The singlet-singlet transition between the two excited states is spin-allowed but parity-forbidden. The lower, O 2 (1 Δ g) state is commonly referred to as singlet oxygen. The energy difference of 94.3 kJ/mol between ground state and singlet oxygen corresponds to a forbidden singlet-triplet transition in the near-infrared at ~1270 nm. [12]

  8. Walmart self-checkout: How retailer's DIY lanes don't check ...

    www.aol.com/walmart-self-checkout-retailers-diy...

    Love it or hate it, self-checkout not going anywhere. Self-checkout is here to stay in the U.S., "with labor cost savings being a key driver – especially in managing peak-time demand," Gallino said.

  9. Photon upconversion - Wikipedia

    en.wikipedia.org/wiki/Photon_upconversion

    Upon TTA the triplet energies are fused leaving one emitter in its excited singlet state (1 Em*) and the other emitter in its ground state. From the singlet excited state the emitter returns to the ground state through the emission of a photon. In this way two low energy photons are converted into one photon of higher energy.

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