Two-pulse nutation NMR
applied to a crystal:
JDK1.0.2 applet




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AIM: Determination of the quadrupole coupling from a featureless NMR lineshape

Two-pulse nutation experiments with a short interpulse delay tau1 are more versatile than one-pulse nutation experiment: We can perform two experiments with different acquisition parameters on the same sample. The fitting of these two nutation data should provide us with the same quadrupolar coupling. A short tau1 avoids the formation of echoes. Three two-pulse sequences are presented:

Two-pulse sequence with a short interpulse delay tau1 for nutation NMR X-X:
{+X}-tau1-{+X}-acq(+y)

Even-X:
{+X}-tau1-{+X}-acq(+y)
{-X}-tau1-{+X}-acq(+y)

Odd-X:
{+X}-tau1-{+X}-acq(+y)
{-X}-tau1-{+X}-acq(-y)

IMAGE: Parameters for the simulation of two-pulse nutation NMR line intensity

The left part of the panel indicates the parameters of the simulation. It is preset for a typical experiment on a spin I = 3/2. You can introduce your own values.

First, we select one of the two-pulse sequences available with the upper choice box.

Then, we select one of the two types of line intensity calculation with the lower choice box:
(1) V-T-F: p1 is variable and p2 is constant, tau1 being a parameter;
(2) F-T-V: p1 is constant and p2 is variable, tau1 being a parameter.

A constant length should be provided in the MinLength field.

MinLength: the first variable pulse-length in s

MaxLength: the last variable pulse-length in s

Step: the increment of the variable pulse-length in s

The following applet is initialized for the central-line intensity of a spin I = 3/2 in a single crystal excited by the X-X two-pulse sequence, where p1 = 5 s, tau1 = 10 s, and p2 increases from 0 to 10 s by 0.5 s step. The experimental line intensities are identical to the simulated ones.

 


JDK1.0.2 applet for two-pulse nutation sequence with a short interpulse delay tau1 applied to a single crystal Applet for calculating and fitting the NMR single crystal line intensity of quadrupolar spin excited by the composite pulse.
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