Spin echo spectroscopy

Spin echo measurements on metal complexes have been reviewed extensively by Mims and Peisach [267]. One use of this technique has been to study anion binding at paramagnetic metal centers. When cupric ion is substituted for ferric ion in transferrin, a pattern corresponding to the weak coupling for in C-doped bicarbonate indicates that bicarbonate is bound directly to the metal ion [269]. Thus, a modulation pattern detected by spin echo can confirm that adducts with a weakly coupled nuclear spin are bound directly to the metal site. 

Spin echo spectroscopy is a definitive technique for determining the binding of imidazole to copper complexes. Detection of spin echo signals is based on the weak coupling of the electron to the unbound imidazole nitrogen, rather than the bound 

Newer techniques for spin echo spectroscopy have been developed recently. More sophisticated pulse sequences are described in many of the references for this section. Fourier transformation of the envelope gives a display of peaks corresponding to the hyperfine couplings. 

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D. Richter, Phys. Rev. Lett., 80, 2346 (1998). Chain Motion in an Unentangled Polymer Melt A Critical Test of the Rouse Model by Molecular Dynamics Simulations and Neutron Spin Echo Spectroscopy. 

Keywords Neutron spin echo spectroscopy Polymer dynamics Reptation ... 

The application of neutron spin-echo spectroscopy to the analysis of the slow dynamics of biomolecules is still in its infancy, but developing fast. The few published investigations either pertain to the diffusion of globular proteins in solution [332-334] or focus on the internal subnanosecond dynamics on the length scale, <10 A as measured on wet powders [335,336]. The latter regime overlaps with other quasi-elastic neutron scattering methods as backscattering and TOE spectrometry [337-339]. 

Monkenbusch M (2003) In Mezei F, Pappas C,Gutberlet T (eds) Neutron spin echo spectroscopy. Basics, trends and applications, vol 601. Springer, Berlin Heidelberg New York... 

C, Gutberlet T (eds) Neutron spin echo spectroscopy. Basics, trends and applications,... 

Extensive analysis of the EPR and redox behavior of this unusual copper protein led to the hypothesis that the protein might contain a Cu(A) site similar to that in cytochrome oxidase (Riester et ai, 1989) and that the unusual seven-line EPR is due to the Cu(A)-type site. An alternative interpretation of this EPR is based on electron spin-echo spectroscopy as well, and that is that the seven-line EPR is due to a half-met Cu—Cu pair and to unusual type I sites (Jin et ai, 1989). Three sets of spin-echo peaks can be attributed to nitrogens on imidazole ligands to a CuA-type site and to another imidazole on the half-met site. The electron spin-echo spectra of cytochrome oxidase are similar, although there is not enough copper in cytochrome oxidase for a half-met site. Conceivably, the property of delocalization of the paramagnetic electron could be effected by the proposed bridging between Cub and heme as (nomenclature summarized by Capaldi, 1990), which are proposed to be 3-4 A apart. 

Di Benedetto, F., Costagliola, P., Benvenuti, M. et al. (2006) Arsenic incorporation in natural calcite lattice evidence from electron spin echo spectroscopy. Earth and Planetary Science Letters, 246(3-4), 458-65. 

Everaers R, Sukumaran SK, Grest GS, Svaneborg C, Sivasubramanian A, Kremer K (2004) Rheology and microscopic topology of entangled polymeric liquids. Science 303 823-826 Ewen B, Richter D (1995) The dynamics of polymer melts as seen by neutron spin echo spectroscopy. Macromol Symp 90 131-149... 

Mims, W. B., Peisach, J. Electron Spin Echo Spectroscopy and the Study of Metalloproteins in Biological Magnetic Resonance, Vol. 3, (eds.) Berliner, L. J., Reuben, J., pp 213-263, New York, Plenum Press, 1981... 

Anticipating further discussions on micro-emulsions, planned for volume V, it is noted that k, or k, or the combination (2kj -i- k ) can also be obtained using scattering techniques or, preferably, combinations thereof. For instance, neutron spin echo spectroscopy (NSES) can be combined with small-angle neutron scattering (SANS) or with dynamic light scattering. Alternatively, 2k + k can be obtained from the polydispersity of the micro-emulsion and then a second type of... 

N. Narayana and, L. Kevan, Characterization of Silver Species Locations and Environments in A, X, and Y Zeolites by Electron Spin Echo Spectroscopy. J. Chem. Phys., 1982, 76, 3999 1005. 

Karthein, R., Motschi, H., Schweiger, A., Ibric, S., Sulzberger, B., and Stumm, W. (1991). Interactions of chromium(ni) complexes with hydrous 5-AI2O3 rearrangements in the coordination sphere studied by electron spin resonance and electron spin-echo spectroscopies. Inorg. Chem. 30, 1606-1611. 

Spin-echo spectroscopy which monitors the modulation of "X magnetization by couplings was employed for spectral editing of resonances of... 

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