Abstract:

In this article we describe the composite π pulse sequence NMR with phase dis tortion and give a theoretical analysis. During optimization, the elements Z₂₂ of Wigner rotation matrix and it's derivatives with respect to pulse and phase angle were used, and the optimization of  pulse and phase angles were carried out. The subroutines of DB SLSJ an d SOLEQJ were programmed instead of “IMSL”subroutine DBCLSJ to solve the non-linear least square problem and obtain the minimization. The calculations were carried out on PⅢ personal computer. The results show that the optimized values are in agreement with those reported in the reference being obtained from IBM/ 3600 computer and better than those reported using other composite π pulses.

Key words: Composite π pulse, Optimization, Calculation,  Program