We report on measurements of deuteron quadrupolar splitting and spin-lattic
e relaxation times T-1Q and T-1Z in the columnar phase of a ring-dauteriate
d hexaoctyloxyrufigallol at 46 MHz as a function of temperature. To describ
e small-step rotations of these molecules within each column in the columna
r phase, a space-fixed frame is used to diagonalize the molecular diffusion
tensor. The principal diffusion constants in this so called 'anisotropic v
iscosity' model D-alpha and D-beta are for rotations of a molecule around a
nd perpendicular to the columnar axis, respectively. A global target analys
is of the spectral densities at seven temperatures in a minimization proced
ure was carried out. We found that D-alpha > D-beta, which is consistent wi
th the picture that the motion towards or away from the local director tend
s to disrupt the packing of molecules within the column.