Nuclear quadrupole splitting

On the basis of the point-charge model formalism, applied on the experimental nuclear quadrupole splitting rationalization, I Agxp I, the results obtained were interpreted in terms of strong complex formation by either Me2Sn(OH)2 or Me3Sn(0H)(H20) with (n = 1 or 2, obtained in phosphate buffer) and... 

The speeific heat of AU55 has been recently measured between 60 mK and 3 K, as a funetion of external magnetic field [54]. The increase in the specific heat at the lowest temperatures was attributed to a possible Schottky tail from Au nuclear quadrupole splitting. 

Spin-orbit coupling, g-factors, nuclear quadrupole splitting, hyperfine interaction are some of the magnitude affected by the Ham effect and one can say that Ham s papers have opened up the wide field of the different spectroscopic techniques to investigate the JT effect. 

Chen N, Pan Y, Weil JA, Nigles MJ (2002c) EPR study of Gd-doped fluorapatite Hyperfine and nuclear quadrupole splitting anisotropy. Geol Assoc Can Mineral Assoc Can Abstr 27 19-20... 

Electric quadrupole interaction, detectable as a line sphtting (nuclear quadrupole splitting A, mm s" ). and ... 

The first term of Eq. 12.3 represents the interaction of the nuclear quadrupole moment with a non-cubic external electric field in the (0,0,0) coordinates and determines the nuclear quadrupole splitting, the conseqnence of the degeneracy removal of the excited state. The second term describes the interaction of the nuclear charge with the electronic clond around the nuclens, and determines the shift of the nuclear level energies. 

Nuclear quadrupole splittings, referred to solid state absorbers at liquid temperature, unless otherwise stated in the cited Refs. Low and high A values are generally reported for each class,... 

The experimental MOssbauer parameters, isomer shift, 5, and nuclear quadrupole splitting, A p, mm s" of organotin-antibiotic derivatives. Tables 12.3-12.5, are characteristic of organotin(lV) derivatives [2,5,72]. The isomer shift, 8, increased within the organotin(IV) antibiotics series from diphenyl to dibutyltin(IV) compounds, and from triphenyl to tributyltin(lV) for the triorganotin(rV) derivatives [2,5,72-74], The small differences could result from small differences in the covalency of the tin-carbon bonds in the complexes. 

Furthermore, from the experimental nuclear quadrupole splittings of the previously mentioned complexes, A, C-Sn-C angles have been calculated as (180 - 26), where 0 has been extracted by solving the equation A = 4 R x [1 - 3 cos 0sin 0], by applying the Sham and Bancroft model [76] and reported in Tables 12.3 and 12.4. 

Table 12.4 Experimental Mossbauer parameters, isomer shift, 6, mm s, nuclear quadrupole splittings A, mms" , measured at liquid temperature, calculated nuclear quadrupole splittings, and C-Sn-C angles for and RjSn(lV)antibiotic derivatives (antibiotic = amoxicUlin, ampicillin and cephalexin) [78,79,81,82]...

Sample thickness ranged between 0.50 and 0.60mg " Sn cm Isomer shift, 8, 0.03, mm s with respect to BaSnO, values Nuclear quadrupole splittings, Aj 0.02, mm s amox, amoxi-cillinate amp, ampidllinate ceph, cephalexinate R, Me, Bu, Ph n.c. = not calculated... 

Nuclear quadrupole splittings averaged over the investigated temperature range... 

In powders, frozen solutions and even single crystals, many of the hyperfine and nuclear quadrupole splittings are typically not resolved in the field-swept EPR spectrum due to inhomogeneous broadening effects. In transition metal complexes, for example, often only flic largest hyperfine coupling from the metal ion is observed. This lack of resolution is mainly due to the transition selection rules, which show fliat the number of EPR lines increases multiplicatively,... 

EuGa4 was studied by Eu and Ga NMR spectroscopies and Eu zero-field NMR signal with well-resolved nuclear quadrupole splitting was observed. ... 

The dynamic properties of the membrane discussed in the previous two sections have their origin in rotation about the bonds in the lipid hydrocarbon chains. It is this rotational isomerism which is the fastest molecular motion and is the fundamental basis or the membrane fluidity. The chain motions are best studied by H NMR of lipids whose chains have been specifically deuterated. The nuclear quadrupole splittings can be used to measure the order... 

It is possible to observe nuclear quadrupole splitting using FR and NQR methods. 

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