Spin pinging

Spin pinging [5.86] has been proposed as a method of using rectangular pulses in 2D homonuclear COSY experiments for tailored excitation. Using spin pinging it would be possible to select regions of overlapping multiplets which are not defined sufficiently in a standard 2D COSY spectrum because of the restricted number of data points. Probably... 

The former possibility previously described could be refuted by the spin-trap-ping experiments and the living radical polymerization of St with 46. Therefore, 13 was added to the polymerization system to conserve the active site of the inifer-ter. It was expected to reproduce the iniferter site due to the formation of DC radicals which can function as primary radical terminators and/or the effective chain transfer ability of 13. It was pointed out that the DC radical generated from 13 had high selectivity for monomers, i.e., 13 acted as an initiator for the polymerization of St, but did not as an initiator for the polymerization of MA, VAc, and AN [72,175,177]. 

Rancourt DG, Ping JY, Berman RG (1994) Mossbauer spectroscopy of minerals. III. Octahedral-site Fe quadrapole splitting distributions in the phlogopite-annite series. Phys Chem Minerals 21 258-267 Rancourt DG, Scorzelli RB (1995) Low-spin Y-Fe-Ni(YLs) proposed as a new mineral in Fe-Ni-bearing meteorites Epitaxial intergrowth of yls and tetrataenite as a possible equilibrium state at 20-40 at % Ni. J Magnet Magnetic Mater 150 30-36... 

The transient formation of 1,3-diphosphaallyl radicals was postulated based on spin-trap-ping products Gouygou M, Tachon C, Koenig M, Dubourg A, Declercq JP, Jaud J, Etemad-Moghadam G (1990) J Org Chem 55 5750... 

Enhanced moments of Gd were found in the alloys containing several percent of Gd (Ping and Coles 1982). Also spin-glass (cluster-glass) behaviour of Gd moments in the UA12 matrix was reported by Coles et al. (1984). 

F. Qiu, S. Chen, Z. Ping, Study of the miscibility and segmental motion of STMAA-PBMA polymer blends and semi-interpenetrating polymer networks by an spin probe method. Magnetic Resonance in Chemistry 43 (5) (2005) 411-416. 

In spin trapping experiments, relatively stable ESR-active compounds, the spin adducts, are formed by reaction of radicals with ESR-silent compounds, the spin traps, added to the smnpie. The most commonly used spin traps are nitroxides and nitrones, which form stabilized radicals by reaction with other radicals (23). Based on the characteristics of the spin adduct (e.g. hyperfine pattern, coupling constants, and g-value), an assignment of the radical in question is often possible. However, due to lack of specificity of the often-used nitroxides, like N-r-butyl-a-phenylnitro-ne (PBN), a valid verification of the radicals trapped depends on identification by tecimiques such as HPLC-MS. Despite the lack of spectral resolution, spin tr q>ping seems to be a promising technique for prediction of the oxidative susceptibility of dairy products (see later sections). 

In eq. (41), d(/)fg destri s (creates) a d(/) electron with spin o on site i. The hq)ping is restricted to the nearest neighbors and scaled as t=t l2y/D. Ug is the screened onsite Coulomb repulsion for the localized f states and V is the hybridization between d and f states. This model retains the features of the impurity problem, including moment formation and screening, but is further complicated by the lattice effects. 

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