Abstract
The high-resolution FTIR spectrum of acetylene in the ∼ 3800 cm −1 region has been analyzed for various hot bands originating from the low-lying ν 4 and ν 5 bending modes. The data have been fitted to a second-order transformed Hamiltonian which includes appropriate off-diagonal terms to account for vibrational and rotational I-type resonances. Parameters for various stretch-bend combination levels, which fit the data with residuals (∼ 2.5 × 10 −4 cm −1) approaching the experimental accuracy, are reported.
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