We study the spin-exchange frequency shifts and line broadening of the
deuterium maser in the temperature range from 0 to 10 K. We consider
both a version operating on the beta-epsilon transition at B = 3.0 muT
and one operating on the beta-delta transition at B = 3.9 mT. For the
first transition, a comparison is made with our earlier results based
on the degenerate-internal-states approximation and its first-order c
orrections [E. Tiesinga, H. T. C. Stoof, B. J. Verhaar, and S. B. Cram
pton, Physica B 165&166, 19 (1990)]. We find cusp structures due to ch
annel thresholds and also resonance structures, both of which disappea
r almost completely after thermal averaging in the temperature range c
onsidered.