Spurious signals caused by the piezoelectric ringing of NaN02 in pulsed NMR

摘要: Abstract Spurious signals caused by the piezoelectric ringing of single crystals NaNO 2 in pulsed NMR have been studied at 14.5 MHz using AM detection. Their amplitude is about two orders magnitude larger than 23 Na FID when a axis crystal along coil, and one order b or c coil axis. The buildup during pulse found to be characterized time constant 10 μec. However, decay following an altogether different which varies with length but 100 μsec. Measurements locations relative rf show that are generated wholly electrostatic interaction, primarily involving longitudinal electric field pulse. A theoretical expression for signal has derived. It accounts many properties gives experimental. Ways suppressing facilitate observation discussed.