Determination of the quadrupole coupling constant from a featureless NMR lineshape
The one-pulse sequence is the simplest NMR experiment. As for a single crystal, the central-line intensity of a powder is independent of the quadrupole coupling constant and is proportional to the pulse length p1, if the latter is short. As a result, this excitation condition of quadrupole spins allows us to quantify the number of spins in the powder. However, the acquisition delay or the "dead time" of the NMR probe head modifies the line intensity.
The left part of the simulation panel indicates the physical parameters. It is preset for a typical experiment on a spin I = 3/2 in a powder. You can introduce your own values.
MinLength: the first value of p1 in µs
MaxLength: the last value of p1 in µs
Step: the increment of p1 in µs
The following applet is initialized for the central-line intensity of a spin I = 3/2 in a powder excited by the one-pulse sequence. The experimental line intensities are 1/10 of the simulated ones.
JDK1.0.2 applet for one-pulse nutation NMR applied to a powder