Redshifts and blueshifts of OH vibrations

Ab initio calculations of potential energy, dipole moment, equilibrium OH distance, force constants, and anharmonic frequencies, and correlation between these quantities, are presented for a water molecule and an OH - ion in a uniform electric field of varying field strength. It is explained why a bound H 2 O molecule in nature always experiences a frequency downshift with respect to the ree molecule, and a bound OH -1 ion, either a downshift or an upshift

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