Chlorine and Deuteron Relaxation Time Measurements in Liquid HCl and DCl

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Abstract
Measurements of chlorine T2 in liquid HCl and DCl have been made over the temperature range of −40° to 60°C. Estimates of the reorientational correlation time made possible by the chlorine measurements were used to evaluate the proton intramolecular dipole contribution which was subtracted from the total intramolecular contribution to obtain the proton spin—rotational contribution. The magnitude of the spin—rotational contribution thus obtained compares with that estimated by Krynicki and Powles. Deuteron T1 times in liquid DCl were measured over the temperature range of −75° to 25°C and found to differ considerably both in magnitude and temperature dependence from deuteron T2 times. Estimates of the quadrupole contribution to the deuteron (1/T1) and, thus, a value of 2.0×1017 V/cm2 for the electric‐field gradient at the deuteron site in DCl were made by use of the reorientational correlation time from chlorine measurements.