th  - 1987 - 51st ENC Conference

WK48
IMPROVED TECHNIQUES FOR THE ACQI//SITION OF TOCSY
AND CAMELSPIN SPECTRA AND COMPUTER SIMULATIONS
OF THE TOCSY EXPERIMENT
Mark Rance
Department, of Mc~e~
R e ~ Ius~t~e of ~
10686 North Tm"rey Pines Road
La Jc~ Califcrni~ 9'2037
The homonuc]ear HarCmann-Hahn coherence transfer (TOCSY) experiment
and the r~-frsme NDE (CAMELSPIN) experiment have become very
im~t ~ far the assignment of proton N MR spectra and for the
spe~c~r~u of ~ c e ~mstraints for use in structure d~m"u~,~t~rs. For
optimal results both of these experiments are normally acquired in a manner
which allows phas~I/ve, alm~'pt/on mode spectz-~ to be obt~ed.
However, in the most ~ ~ o ~ implemen~ of 1~hese %e~es
phase anomalies greatly degra~le the quality of the 6pe~r'a. In addit~cm,
many commercial ~ectrom~ are not ideally suited for the
hardware demands required for opt~al perfm-mance of these exper~ents.
We will ~ a novel technique far the ~ 1 ~ ~ of phase anomalies
which is based an z-fil~ and which can be ea.~y adapted for either the
TOCSY ¢r the CAMELSPIN experiment and can be readily implemented on
most. spectrometers. This technique also allows optimal pceit/m~zing of the rf
during the mixing period in both experiments. Some results will
also be presented from computer ~im~ of the TO CSY experiment,
involv'ing the evaluation of various ~ schemes and the determlua.t:m~n of
optimal experiment parameters for a varie~ af spin sys~ms.