Modified steady-state free precession pulse sequences for the detection of pure nuclear quadrupole resonance.
Modifications of the steady-state free precession multi-pulse technique for the effective detection of the nuclear quadrupole resonance (NQR) signals are proposed. These modifications are based on the use of composite pulses and enable the suppression of the coherent noise signals such as the magneto-acoustic and piezo-electric signals or the ringing signal from the NQR probe. Experimental results of applying the proposed technique to nitrogen-14 NQR in the sample of C6H12N4 are also presented and convincingly demonstrate its effectiveness.
Rudakov
T N
TN
Research Division, QRSciences Limited, Cannington WA 6107, Australia. trudakov@qrsciences.com
Mikhaltsevitch
V T
VT
Flexman
J H
JH