REFERENCES
1.
H. S.
Gutowsky
, R. L.
Vold
, and E. J.
Wells
, J. Chem. Phys.
43
, 4107
(1965
), and prior work cited therein.2.
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.
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 is so short that the 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N. Boden, J. Deck, and H. S. Gutowsky (unpublished results).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.
11.
12.
When is too short for use of the spin‐echo method described here, in systems may be obtained by direct measurement of and 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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© 1966 American Institute of Physics.
1966
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