Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
108 (1998), S. 1881-1885
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Nutation nuclear quadrupole resonance spectroscopy enables one to determine the asymmetry parameter on powder samples. The method relies on two-dimensional methodology: The first period is the duration of the radio frequency exciting pulse and the second dimension is the free-evolution period of the quadrupolar nucleus. Varying lengths of the radio frequency pulse induce an amplitude modulation of the free-induction decay signals which is characteristic of the anisotropic nutation frequency distribution. Fourier analysis along the first dimension provides a powder nutation line shape that allows determination of the electric field gradient tensor's asymmetry parameter. We describe the first application of two-dimensional phase-modulated spectroscopy to a quadrupolar nucleus at zero field. It is shown that a phase-modulated variant of the nutation spectroscopy is feasible in the pure quadrupole regime and it provides a gain in the signal-to-noise ratio compared to the amplitude-modulated method. © 1998 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.475566
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