Experimental Investigations of the Strong Off-Resonant Comb (SORC) Pulse Sequence in ¹⁴N NQR

Abstract

Abstract The behavior of induction signals during steady-state pulse irradiations in 14 N NQR was investigated experimentally. It has long been known that the signal response to a long sequence of η pulses will dramatically increase for pulse spacings less than T 2 . This increase is exponential, and can result in signals comparable to optimally prepared Free Induction Decays. Because these "SORC" signals recur as long as the pulsing continues, very efficient signal-averaging can result. The dependence of these quasi steady-state signals on pulse parameters and on frequency offset are presented, together with a discussion of the applicability of the method.