Density functional theory was used to study the hydrogen bonding between th
e water molecule and the hydroxyl radical. The two energetically low-lying
minima are 1 ((2)A') and 2 ((2)A"), with hydrogen bonding occurring between
the oxygen atom of H2O and the hydrogen atom of the OH radical. Another hy
drogen bond (3, (2)A") occurs between one of the hydrogen atoms of H2O and
the oxygen atom of OH. The interaction energies for various isomers were ca
lculated at the UB3LYP, UMP2 and CCSD(T) levels. The infrared spectra and t
he vibrational frequency shifts are also reported. (C) 1999 Elsevier Scienc
e B.V. All rights reserved.