Abstract
The CH stretching overtone spectrum of liquid-phase trichloroethylene is studied using the dual beam thermal lens technique (Δ V s = 6) and conventional absorption method (Δ V s = 2-5). The high value of the mechanical frequency is attributed to CH bond strengthening resulting from the electron-withdrawing property of the halogen atoms. The empirical relation between CH bond length and fifth overtone energy predicts that the CH bond in trichloroethylene is 0.002 Å smaller than that in ethylene. The Δ V s = 3 region shows Fermi resonance between pure overtone and stretch—bend combination states. The magnitude of the Fermi resonance matrix element is close to that reported for dichloromethane.
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