## Example 2 of MQMAS simulation

The example, which is complementary to Example 1, also
deals with the **central-transition echo amplitude** of a
**spin** I = 3/2 in a powder sample rotating at the magic
angle with a **rotor speed of 10 kHz**.

The strength of the **RF magnetic field is 100 kHz**.

The values of the two quadrupole parameters are **1000
kHz for the quadrupole coupling constant QCC** and **0
for the asymmetry parameter eta**.

The simulation associated with the MQMAS sequence is
**A()B(p2)**, where the second-pulse length **p2 increases
from 0 to 10 µs by 0.25 µs step**; the first-pulse length
**p1 is 6 µs**. There is no interpulse delay (tau1 = 0,
this is an approximation) whereas experimental tau1 is
about 10 µs.

The pulse length to pulse increment ratios are integers.

The number of integration steps for alpha and
for beta Euler angles are **MaxAlpha = 20**, that for
gamma Euler angle is **MaxGamma = 10**.

The first pulse excites **the -3-quantum
coherence only**.

The sign of the central-transition echo amplitude **also
does not change** for a long range of the second-pulse length
p2 as in Example 1. This curve differs a lot with that obtained in
Example 2 of two-pulse MAS simulation.