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  2. Triplet-triplet annihilation - Wikipedia

    en.wikipedia.org/wiki/Triplet-Triplet_Annihilation

    A Jablonski diagram describing the mechanism of 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).

  3. Tuplet - Wikipedia

    en.wikipedia.org/wiki/Tuplet

    The most common tuplet [9] is the triplet (German Triole, French triolet, Italian terzina or tripletta, Spanish tresillo).Whereas normally two quarter notes (crotchets) are the same duration as a half note (minim), three triplet quarter notes have that same duration, so the duration of a triplet quarter note is 2 ⁄ 3 the duration of a standard quarter note.

  4. Singlet fission - Wikipedia

    en.wikipedia.org/wiki/Singlet_fission

    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.

  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. Two-photon absorption - Wikipedia

    en.wikipedia.org/wiki/Two-photon_absorption

    Schematic of energy levels involved in two photons absorption. In atomic physics, two-photon absorption (TPA or 2PA), also called two-photon excitation or non-linear absorption, is the simultaneous absorption of two photons of identical or different frequencies in order to excite an atom or a molecule from one state (usually the ground state), via a virtual energy level, to a higher energy ...

  7. Grade 8 - Wikipedia

    en.wikipedia.org/wiki/Grade_8

    Eighth grade, the eighth year of education in some countries Grade 8, the highest level of ABRSM#Graded music examsit is the first year of high school and first year of teenage. Science

  8. EXCLUSIVE: Triplets find out their birth order at age 18 in ...

    www.aol.com/news/exclusive-triplets-birth-order...

    Triplets Janie, Wright and Luke Hilbert found out their birth order on their 18th birthday in a moment shared on TikTok. Their parents explain to TODAY.com why they waited to tell them.

  9. Eighth grade - Wikipedia

    en.wikipedia.org/wiki/Eighth_grade

    Eighth grade (also 8th Grade or Grade 8) is the eighth year of formal or compulsory education in the United States of America. The eighth grade is the second, third, or fourth (and typically final) year of middle school. Students in eighth grade are usually 13–14 years old. Different terms and numbers are used in other parts of the world.

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