Abstract
Contributions to the deuterium nuclear spin-spin relaxation in powder samples are discussed in terms of homo- and heteronuclear dipolar couplings. Dipolar dephasing due to heteronuclear dipolar coupling to spin-1/2 nuclei in particular can, in principle, be refocused by the insertion of [pi] pulses in the quadrupolar echo experiment. The efficiency of the refocusing depends on the dipolar interactions among the spins in the spin-1/2 reservoir. Theoretical expressions are derived for the FID in the quadrupolar echo and the combined quadrupolar Zeeman echo. An experiment on trimethyl-d[sub 9]-ammonium tetraphenylborate is used to test the theory.
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