Relative receptivity

Isotope Nuclear spin quantum no. I NMR frequency rel to H(SiMe4) = 100.000 Relative receptivity D ( Nuclear quadmpole moment Q (e 10-2 ... [Pg.803]

Isotope Spin Natural Abundance Magnetic Moment m/Mn Magnetogyric Ratio y/107 rad s 4T 1 Quadrupole Moment Ql fm2 Frequency Ratio 2.35 T Reference Compound Relative Receptivity ... [Pg.338]

Parameters of the 29Si nucleus have been given in all previous reviews of 29Si NMR, and detailed comparison with other nuclei can be found in reviews of Harris and coauthors6,10 and Brevard and Granger11, which also give clear definitions of the terms (e.g. relative receptivity) used in the discussion. [Pg.225]

Isotope Spin Natural abundance (A) (%) vo at 9.4 T Relative receptivity" Quadrupole moment (fm2)7 Quadrupole broadening factor4 Stemheimer antishielding factor (70c) ... [Pg.123]

Relative receptivity the receptivity6 given by 7,AI(I+ 1) relative to l3C adjusted for quadrupolar nuclei by the fractional contribution of the central transition. [Pg.123]

At 93.1% natural abundance, 39K appears to be quite an attractive nucleus for NMR, having a relative receptivity, considering the central transition alone,... [Pg.150]

From Appendix A, find the relative receptivities (sensitivity X abundance) of1]- , 13C, 15N, and 57Fe. [Pg.47]

The study of the fiillerenes by C NMR spectroscopy is not straightforward. C has a low natural isotopic abundance (1.11%) and a low relative receptivity. In addition, the carbon atoms in fiillerenes have relatively long relaxation times and spectra for the higher, less symmetric fiillerenes can only be obtained within a reasonable time by using paramagnetic relaxation reagents, typically Cr(acac)3. [Pg.613]

Chromium has the atomic number 24. Of the 13 known isotopes (mass numbers 45-57), four are stable, giving chrominm the relative atomic mass 51.9961 ( C = 12.0000). Table 1 lists the properties of some isotopes. Cr may be used for NMR spectroscopy however, its relative receptivity (8.62 x 10 , H= 1.00), quadmpole moment (4.1 x 10 ° m ), and low resonance frequency (16.956MHz, H = 300MHz) pose experimental difficulties. Radioactive Cr is used in medical tracer studies. [Pg.767]

Isotope Natural abimdance (x/%) Magnetic moment (m/mn) Magnetogyric ratio (y/lOGads-i T- ) Frequency ratio (S%) Reference compormd Sample conditions Relative receptivity ... [Pg.6168]

Tables 1.1 and 1.2 also provide information about the NMR sensitivities of the various nuclei, listed as their receptivity relative to Si, with the absolute sensitivity defined by Harris (1984) as 7 C(I(I +1)) where C is the natural abundance of the nucleus and y is its gyromagnetic ratio. The relative receptivities of the quadmpolar nuclei in Table 1.2 have been adjusted by taking into account the fractional contribution of the central transition.

$Tables 1.1 and 1.2 also provide information about the NMR sensitivities of the various nuclei, listed as their receptivity relative to Si, with the absolute sensitivity defined by Harris (1984) as 7 C(I(I +1)) where C is the natural abundance of the nucleus and y is its gyromagnetic ratio. The relative receptivities of the quadmpolar nuclei in Table 1.2 have been adjusted by taking into account the fractional contribution of the central transition.$

Nucleus Natural abundance (%) V() at 7.05 T (MHz) Relative receptivity Standard substance... [Pg.13]

Nucleus I Natural abundance (%) Vo (MHz) at 7.05 T Relative receptivity Quadrupole moment (mb) Quadrupole broadening factor Stemheimer antishielding factor (y)... [Pg.15]

With its natural abundance of 93.1% and a relative receptivity of its central transition comparable to that of C, K appears to be a suitable nucleus for solid state NMR. These factors are to some extent offset by its small magnetic moment and quadrupolar characteristics which have limited the number of solid-state NMR studies to date. An early study demonstrated the success of the nuclear quadrupole double resonance... [Pg.495]

The 2 NMR-active nuclei of cadmium are both spin I = /2, and have similar natural abundances (12.75% for " Cd and 12.26% for Cd). However, the relative receptivity of Cd is slightly better (see Chapter 1, Table 1.1), making it the nucleus of choice for many Cd NMR studies. Cadmium NMR has proved useful in studies of semiconducting oxide compounds and alloys, and of cadmium exchange in clay minerals and zeolites. The chemical shifts of Cd compounds are normally reported with respect to aqueous Cd(C104)2 solution. [Pg.587]

Nucleus I 31/10 rad T s ) Natural abundance (%) Resonance frequency Relative receptivity ... [Pg.1908]

Relative receptivity of various nuclei with respect to... [Pg.1908]

Isotope Natural abundance (%) Magnetic moment (m/Mn) Magnetogyric ratio Y (10 radT s ) NMR frequency (H, Hz)"-" Relative receptivity D( C) ... [Pg.204]

It is fortunate that P is a dipolar nucleus. However, it is frequently bonded to quadrupolar nuclei, such as N, Co, Cu, Cu, Pd, Ir, and " Au. The magnitude of complications depends on factors such as natural abundance of the isotope, quadruple moment, and the relative receptivity. [Pg.5]

Nucleus Natural Abundance [%] Magnetic Moment //[ iN] Magnetogyric Ratio r[10 rad T- s-i] NMR frequency B [MHz] Standard Relative Receptivity Ef Relative Receptivity... [Pg.7]

Nucleus Natural Abundance Relative Receptivity Applications... [Pg.340]

Iso- tope Spin / Magnetic moment ll Magneto-gyric ratio y 10 [rad T s" ] Natural abun- dance [%] Relative receptivity //p Dc Precessional frequeiKy v at Bi, = 2.35 T[MHz] Quadra-pole moment Q [fm"l... [Pg.4080]

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