Anharmonic Stretch–Stretch Interaction Force Constants of Triatomic Molecules

Abstract
A model is proposed which, using the generally accepted form of the potential‐energy surface in the two bond stretching coordinates, allows the prediction of the anharmonic stretch–stretch interaction force constants from the quadratic interaction force constant. The model is applied to CO2 and N2O. Hydrogen cyanide, OCS, and H2O are also discussed.