Rotationally inelastic scattering cross-sections and van der Waals rov
ibrational spectra of the H-2-OH system are calculated using two ab in
itio potential surfaces. The scattering calculations give similar resu
lts when both ab initio potentials are used, and show quite good agree
ment with available experimental data. The van der Waals bound states
and rovibrational spectra show interesting similarities and difference
s when compared with the related and well studied Ar-OH and H-2-HF sys
tems. Aspects of the spectra calculated using two ab initio potentials
show marked differences, and suggest that experimental studies of the
far infrared or near infrared spectra of H-2-OH will be worthwhile.