Triplet interaction

The first extension of this model, which accounts for the special character of the amphiphiles, has been the three-component model introduced by Schick and Shih in 1987 [171]. They simply add an additional triplet interaction... 

In order to check the consistency and mutual relations of ECIs calculated by various methods, as well as to compare them with experimental data, we have performed calculations for several alloy systems, as diverse as Cu-Nl, Al-Li, Al-Ni, Ni-Pt and Pt-Rh. Here we present the results for Al-Ni, Pt-Rh and Ni-Pt alloys in some detail, because the pair interactions between the first neighbors are dominant in these alloys which makes the interpretation relatively simple. On the other hand, the pair interactions between more distant neighbors and also triplet interactions are important for Al-Li and Cu-Ni. The equilibrium atomic radii, bulk moduli and electronegativities of A1 and Ni are rather different, while Pt and Rh are quite similar in this respect. The Ni and Pt atoms differ mainly by their size. 

Once again, we note that the triplet cooperativity is not simply related to the pair interactions—as expected from the triplet interaction energy, Eq. (5.10.7). It is neither a product of the pair correlation (as normally expected from nearest-neighbor interactions), nor the sum of pair correlations g a, b) and g b, c) as assumed by Ackers et al. (1982, 1986). Again, the difference between the free energy of... 

T. P. Softley I would like to ask Prof. Jungen if there is any experimental evidence for the need to include singlet-triplet interaction in a quantum defect description of H2 ... 

Snaathorst et al h 12 have investigated the acetone solvate of the salt [Cu(mnt)2]2 [MB+]2 (where MB = methylene blue) by single-crystal ESR techniques. They found that the complex consisted of dimerized aniens each with a singlet ground state and a thermally accessible triplet state. At 4.2 K, triplet-triplet interactions between dimers along the a axis were responsible for satellite lines in the ESR spectrum. 

SOMO and SOMO, too. The delocalized spin on the donor site and the localized spin on the radical site in these cation diradicals are oriented in a parallel manner. As will be seen in Chapter 7 (Section 7.4), such a spin orientation results in ferromagnetic coupling (triplet interaction) between the spins. In contrast, an antiparallel type of mutual orientation of the spins results in antiferromagnetic coupling. The parallel type is crucial in the design of organic materials with magnetic properties. 

The triplet-triplet interaction, postulated to explain increased quantum yield of thin film organic LEDs, has been well known in EF of organic single crystals [2,21,41], One of the most spectacular manifestation of this type excitonic interactions is spatial distribution of EL emission (see Sec. 3.3). Interestingly, the EL light output resulting from the free-trapped carrier recombination (Oel) with respect to that underlain by free carriers recombination (Oel) does not depend on the trap depth [2]... 

Triplet-triplet Interaction, Singlet Exciton Fission... 

Colliding triplet excitons are said to undergo triplet-triplet fusion. If they belong to the same species, the process is called homofusion. The collision of triplets belonging to different species is called heterofusion. The final products of the triplet-triplet interaction process are preceded by intermediate complex pair states ... 

The vibrationally excited singlet Si and triplet Tf, expected upon the annihilation of the lowest excited triplets Ti, have an energy below the autoionization threshold of typical aromatic crystals [26], thus, no intrinsic photoionization has been observed in these solids. However, the presence of intentional or non-intentional admixtures can allow the triplet-triplet interaction-induced photoionization forming a free carrier in the matrix and a trapped carrier on an admixture molecule. Also, such a process has been reported for the CT triplet states localized on the donor molecule, e.g. in polycrystalline samples of CT complex anthracene-tetracyanoben-zene, where the triplets are localized on the anthracene donor (3Di). Annihilation of 3Di results in the population of non-relaxed excited states of the complex 1(D+A ) and 3(D+A") , dissociation of which may lead to the formation of free charges D+ [214]. 

The mechanism of interaction between the triplet state of a porphyrin and molecular oxygen involves the formation of an encounter pair that may have singlet, triplet, or quintet spin multiplicities. Spin statistics determine the probability of forming each one of these pairs. When two triplets interact, they give nine encounter pair spin states with equal probability, five of which are sublevels of the encounter pair with quintet... 

Unique architectural features of tRNAs also can serve as identity elements (2). For example, the long variable loop of IRNA " interacts specifically with SerRS. In addition, the tertiary G15 G48 Levitt base pair in E. coli tRNA , and the triplet interaction in tRNA P, is formed between G45, and the G10 U25 parr confers identity. Occasionally, modified nucleotides can act as determinants, as in the case of coli tRNA , tRNA , tRNA T , and yeast tRNA . All of these tRNAs contain modifications in the anticodon loop. 

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