By Ray Freeman, J. B. Robert (auth.), Professor J. B. Robert (eds.)
ISBN-10: 3642488145
ISBN-13: 9783642488146
ISBN-10: 3642488161
ISBN-13: 9783642488160
In fresh years numerous advancements were made within the production of resistive, superconducting and hybrid magazine nets. Condensed topic physicists are these days doing ex periments in regular magnetic fields of as much as 30 Tesla. however the box homogenity {/B}, required in a quantity of the order of a three few cm is generally a number of orders of significance much less serious than the single that is wanted for top answer NMR. over the past 30 years, with every one iteration of latest excessive solution NMR spectrometers, from a hundred MHz as much as six hundred MHz, taking advan tage of the rise in sensitivity and backbone, new parts of study were opened in chemistry, actual chemistry and biochemistry. The new release of the 20 Tesla supercon ducting magnets is coming. hence one may possibly heavily begin to contemplate excessive solution NMR at 1 GHz. the aim of this quantity is to envision a number of the merits which are received at such excessive frequencies and a few of the issues we will be dealing with. an immense point of NMR at excessive box which isn't offered during this quantity matters the layout of the magnet. The development of a superconducting magnet, generating a box 10 three better than 20 T, with a box homogeneity IlB/B 10- , in a cm quantity nonetheless continues to be at the present time in 1990 an incredible problem. Grenoble, France J. B. Robert Guest-Editor Professor J. B. Robert carrier nationwide des Champs Intenses B. P.
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Example text
The development of higher fields in NMR spectroscopy will facilitate these studies, since both the accuracy and the detection limit will increase. The power of the NMR magnetic field alignment method, as compared to other techniques, lies in its inherent simplicity: experimentally, it is not complex, it is widely applicable and usually the interpretation is straightforward, relying on only a few non-critical assumptions. Although the same applications, as were given for diamagnetic molecules, can also be made for paramagnetic molecules, results for the latter are much sparser.
Soc. 108: 1354 11. Bothner-By AA, Domaille PJ, Gayathri C (1981) 1. Am. Chern. Soc. 103: 5602 12. Bothner-By AA, Gayathri C, van Zijl PCM, MacLean C, Lai JJ, Smith KM (1985) Magn. Reson. Chern. 23: 935 13. Facchine KL, Staley SW, van Zijl PCM, Mishra PK, Bothner-By AA (1988) J. Am. Chern. Soc. 110: 4900 14. Lisicki MA, Mishra PK, Bothner-By AA, Lindsey JS (1988) J. Phys. Chern. 92: 3400 15. van Zijl PCM, MacLean C, Skoglund CM, Bothner-By AA (1985) J. Magn. Reson. 65: 316 16. Saupe A (1964) Z. Naturforsch.
Interpretation of these order parameters then allows the determination of molecular magnetic susceptibility anisotropies L1X and asymmetries bX; see Eqs. (4), (5) and (20). To find the order parameters from experimental line splittings some additional information is required. In the dipolar case the internuclear distance r has to be known and for the quadrupolar case the quadrupole coupling constant (e 2qQ/h) and the asymmetry parameter 1J have to be available. Also the structure of the molecule is needed for the direction cosines (cos 8afJ ,,).
NMR at Very High Field by Ray Freeman, J. B. Robert (auth.), Professor J. B. Robert (eds.)
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