By S. Berger, N. M. Sergeyev, J. M. Risley, R. L. Van Etten
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22) was tested by Monte Carlo calculations of probability densities of(bv)dig and (bV)S/N. , with half-width of ca. , ca. 1/100 of the half-width) if only the SIN ratio exceeds 10 and fitting on at least five points is used. This shows that in high precision experiments the line position in the spectrum can be determined with an accuracy two orders better than the width of the line to be measured if only digital resolution and SIN ratio meet the necessary requirements. V dig ), Chertkov and Mstislavsky [77J obtained an analytical relationship for the total variance: JS/N.
Amer. Chern. Soc. S. Chern. Comm. 1986: 627 Andrews GC, Chmurny GN. Whipple EB (1981) Org. Magn. Reson. 15: 324 Milosavljevic S. Jeremic D. Mihailovic ML. Wehrli FW (1981) Org. Magn. Reson. 17: 299 Jeremic D. Milosavljevic S. Mihailovic ML (1982) Tetrahedron 38: 3325 Pehk T. Laht A. Lippmaa E (1982) Org. Magn. Reson. 19: 21 Berger S. Diehl BWK (1987) Magn. Reson. Chern. 26: 327 Lee SF. Edgar M. Pak CS. Barth G. Djerassi C (1978) lAmer. Chern. Soc. 100: 8012; Lee SF. Barth G. Kieslich K. Djerassi C (1978) J.
46], though being aware of negative signs of geminal coupling constants, still used positive signs. This misunderstanding led Jameson and Osten [21] to the erroneous sign of isotope effects on geminal coupling constants 2JeH, lH). In some cases (for example, for 2Je 9F, lH) in flu orosi lanes [47], or for direct coupling constants 1J (69 Ga, 1H) and 1J lGa, 1H) [48]), the signs of coupling constants, and therefore, the signs of isotope effects remain unknown. 4 Values of Unperturbed Coupling Constants Usually, the main problem in determining the isotope effect on the coupling constant is the accurate measurement of the perturbed coupling for a heavier isotopomer.