Abstract: It is provided that a modified method for selective detection of multiple-quantum coherences in which a pair of Z pulse is used separately at the end of preparation and mixing period in 2D MQ spectrocopy can efficiently decrease the "leakage" from SQC signals and needn't use the digital phaser. Theoretical calculation for AMX spin system with density operators is given and coincides with the results of experiments.

Key words: multiple-quantum coherences a pair of Z pulses