ZZ-filter

DESCRIPTION
Magnetization transfer between two J-coupled heteronuclei, I and S, is usually achieved by a pair of simultaneous 90° pulses in the so-called Hetero-COSY block, preceded and followed by delays for J dephasing and rephasing. A simple way to remove unwanted magnetization is obtained applying a PFG between these two pulses in order to select the desired zz magnetization.

This building block is largely used in gradient-enhanced multidimensional HSQC-type experiments.

REQUIREMENTS
Easy implementation on AVANCE spectrometers equipped with gradient technology.
EXPERIMENTAL DETAILS
 
SYNTAX
The standard way to implement an heteronuclear magnetization transfer element in a pulse program is:
...
(p1 ph2):f1
d13
p16:gp1
d16
(p21 ph3):f3
...
in which:
RELATED TOPICS
The heteronuclear magnetization transfer element is usually combined with water suppression purposes using the water flip-back technique in HSQC-type experiments