2D HOM2DJ Experiment

This two-dimensional absolute-value HOM2DJ spectrum shows (decoupled) chemical shifts on one 2D axis and coupling constants along the other 2D axis. Before setting up the HOM2DJ experiment, see Acquiring and Processing 2D Experiments. See the Varian Guide to NMR Experiments for a complete description of this experiment.

Acquiring the experiment:

1. Join the experiment in which the 1H reference spectrum was collected. Type hom2dj.

2. Type dg. Adjust the parameters listed below for the standard HOM2DJ:

sfrq=399.879 dm='n'

tn=H1 sw1 = 8 to 48

at = set by spectrometer ni = 4*sw1 (thus, resolution = 1/4 Hz)

np=2048 dp='n'

sw = sw from 1H reference spectrum hs='n'

ss=2 phase=0

tpwr = listed at console

pw = 1H 90° pulse width

p1= 1H 180° pulse width

d1 = 1H relaxation delay (1-2 * 1H T1)

d2=0 rf1 = rf from 1H reference spectrum

presat='n' rfp1 = rfp from 1H reference spectrum

tof = tof from 1H reference spectrum wp1 = wp from 1H reference spectrum

nt = multiple of 16 sp1 = sp from 1H reference spectrum

ct = set by computer

Change ni, nt, and d1 to suit your scheduled time. The vertical (non-acquisition) resolution equals sw1/ni. Typical values are listed below:

d1
ni
sw1
nt
time
vert. res
d1
ni
sw1
nt
time
vert. res

1.5
32
8
16
0:32
0.25 Hz
1.5
32
8
64
2:06
0.25 Hz

1.5
96
8
16
3:17
0.08
1.5
96
8
64
13:07
0.12

1.5
192
8
16
11:41
0.04
1.5
192
8
64
46:43
0.06

1.5
32
48
16
0:18
1.5
1.5
32
48
64
1:11
1.5

1.5
96
48
16
1:10
0.5
1.5
96
48
64
4:40
0.5

1.5
192
48
16
3:11
0.25
1.5
192
48
64
12:45
0.25

Processing, Displaying, and Plotting:

Process using the procedure for Processing a 2D Absolute-Value Experiment. Plot pos. only contours. After processing, type rotate(45.0). The command foldj can then be typed to symmeterize the spectrum.

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Last updated: April 1st, 1998
URL: http://nmr.chem.indiana.edu/NMRguide/2dexpt/hom2dj.html
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