用首尾减半法改善DANTE序列边瓣的抑制

SUPPRESSION OF SIDE-BANDS BY HALF OF THE FIRST AND THE LAST PULSES WIDTH IN DANTE SEQUENCE

用Ｄａｎｔｅ脉冲序列作选择激励的缺点是它的激励边瓣太大．对于强峰存在的谱在选择激励其他峰时残留部分有时很大而引起对相干转移的误判．这里提出把Ｄａｎｔｅ序列中首尾两个脉冲宽度减半的方法可以把抑制比降低至原来残留部分的１／５０左右．

The defect for using Dante sequence as a band-pass selective excitation pulse is the strong remained side-bands,when a weak peak is excited in a spectrum with the other strong peaks.Sometimes,this remained part of the strong peak is still very large,which will lead to make a mistaken assignment for the coherence transference. In this report, we suggest to reduce the width of the first and last pulse in Dante sequence to a half.By means of this method,the remained peak can be suppressed to about 1/50.