Properties of Selected Nuclei

Table 9.9 Nuclear spin quantum numbers and magnetic properties of selected nuclei...

The quadrupolar relaxation mechanism is only directly relevant for those nuclei that have a nuclear spin quantum number, I, greater than V2 (quadrupolar nuclei) and is often the dominant relaxation process for these. This can also be a very efficient mechanism and the linewidths of many such nuclei can be hundreds or even thousands of hertz wide. The properties of selected nuclei with I > V2 are summarised in Table 2.3. Whilst the direct observation of these... 

Table 2.4 Properties of selected nuclei observed by Mossbauer spectroscopy. The radioisotope source provides the y-radiation required for the Mossbauer effect.

Table 9.7 Magnetic properties of selected nuclei (data from Cantor and Schimmel, 1980)...

TABLE 5.2 Nuclear spin properties of selected nuclei. The predicted frequency p for the lowest energy nuclear spin state transition is included. 

Table 1 The spin properties of selected spm-1/2 nuclei. (Adapted from R. Harris et al lUPAC) ...

Table 2.3 Properties of selected NMR active nuclei. A complete list is available from WebElements on the World Wide Web at http //www.webelements.com/...

Table 2.1. Properties of selected spin- /z nuclei. Frequencies are given for a 400MHz spectrometer (9.4 T magnet), and sensitivities are given relative to proton observation and include terms for both intrinsic sensitivity of the nucleus and its natural abundance...

It is possible to visualize flow of current directly from calculations of the induced current density for the molecule in an external magnetic field, from which accurate values of magnetizability of the molecule and nuclear magnetic shielding of selected nuclei may be calculated by integration. Contributions to the integral properties can be analyzed using property densities, such as the... 

Ground state nuclear moment properties of selected non-rare earth nuclei, for NMR purposes, adapted from Fuller (1976). 

Table 1 Properties of selected NMR-active nuclei of interest in solution NMR of polymers...

Electrons, protons and neutrons and all other particles that have s = are known as fennions. Other particles are restricted to s = 0 or 1 and are known as bosons. There are thus profound differences in the quantum-mechanical properties of fennions and bosons, which have important implications in fields ranging from statistical mechanics to spectroscopic selection mles. It can be shown that the spin quantum number S associated with an even number of fennions must be integral, while that for an odd number of them must be half-integral. The resulting composite particles behave collectively like bosons and fennions, respectively, so the wavefunction synnnetry properties associated with bosons can be relevant in chemical physics. One prominent example is the treatment of nuclei, which are typically considered as composite particles rather than interacting protons and neutrons. Nuclei with even atomic number tlierefore behave like individual bosons and those with odd atomic number as fennions, a distinction that plays an important role in rotational spectroscopy of polyatomic molecules. 

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