NQR Parameters‌ Flip Angle Sample Clauses

NQR Parameters‌ Flip Angle. By applying an RF excitation magnetic field, the quadrupole moments will be tilted away from the stable thermal equilibrium state determined by the nearby electric field gradient. That flip angle α is given by α = 2γB1tw. Here, γ is the gyromagnetic ratio of nitrogen nucleus, B1 is the excitation magnetic field, tw is the pulse duration (irradiation time). Then the NQR signal is generated when the quadrupole moments are relaxing by precessing at the resonance frequency. The amplitude of the generated NQR signal corresponds to the flip angle. To obtain a strong signal when using the basic excitation pulse sequence, the free induction decay (FID)sequence, it is necessary to set the appropriate pulse duration to achieve the optimal flip angle. (The FID sequence is explained in detail in section2.2.5.) In the case of powder samples, the optimal flip angle α is 119.5 degrees [22]. As the flip angle increases, the signal becomes weaker, reaching its minimum at 257 degrees. B1 becomes weaker as the sample moves away from the antenna thereby requiring a longer tw to maintain the optimal flip angle α.
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