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1.
H. S.
Gutowsky
,
R. L.
Vold
, and
E. J.
Wells
,
J. Chem. Phys.
43
,
4107
(
1965
), and prior work cited therein.
2.
H. Y.
Carr
and
E. M.
Purcell
,
Phys. Rev.
94
,
630
(
1954
).
3.
The experimental techniques are those described by
A.
Allerhand
and
H. S.
Gutowsky
,
J. Chem. Phys.
41
,
2115
(
1964
).
4.
A.
Allerhand
and
E.
Thiele
,
J. Chem. Phys.
45
,
902
(
1966
); we thank the authors for sending us a preprint.
5.
S.
Binsch
,
J. B.
Lambert
,
B. W.
Roberts
, and
J. D.
Roberts
,
J. Am. Chem. Soc.
86
,
5564
(
1964
).
6.
W. B.
Moniz
and
H. S.
Gutowsky
,
J. Chem. Phys.
38
,
1155
(
1963
).
7.
We have, however, observed modulation of the echo train in similar systems.8 The modulation is eliminated by making the pulse separation small with respect to the spectral parameters. No modulation was observed in the case of 2‐fluoropyridine because T1N is so short that the tcp at which an echo train could be observed for it is sufficiently short to remove the modulation.
8.
N. Boden, J. Deck, and H. S. Gutowsky (unpublished results).
9.
We wish to thank R. L. Vold for his assistance with the calculations.
10.
J. A.
Pople
,
Mol. Phys.
1
,
168
(
1958
).
11.
M.
Suzuki
and
R.
Kubo
,
Mol. Phys.
7
,
201
(
1963–64
).
12.
When TIX is too short for use of the spin‐echo method described here, |JAX| in AnX systems may be obtained by direct measurement of T1A,T2A, and T1X as described by A. Abragam, Principles of Nuclear Magnetism (Oxford University Press, London, 1961), p. 331;
J.
Winter
,
Compt. Rend.
249
,
1346
(
1959
).
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