Coriolis interactions and assignments of the fundamental bands in ethylene oxide and ethylene oxide-d4

Abstract

The Coriolis interactions among ν₅, ν₁₂, and ν₁₅ of C₂H₄O and those among ν₄, ν₅, ν₁₂, and ν₁₄ of C₂D₄O were analyzed to clarify the intensity borrowing phenomena. The signs of the product ζ_rs(∂p/∂Q_r)(∂p/∂Q_s) have been determined for all pairs of the above fundamentals. As a result, earlier assignment of ν₁₂ and ν₁₅ of C₂H₄O has been found to be erroneous. According to the new assignment, the fundamental frequencies of ν₁₂ and ν₁₅ are 822.26 and 808.3 cm⁻¹, respectively. The force field of this molecule was calculated using the new assignment of the fundamental bands.