# 10 $\mu m$ INFRARED SPECTRUM OF TETRAHYDROFURAN: QUENCHING OF CORIOLIS INTERACTIONS IN THE VIBRATIONALLY EXCITED STATE

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 Title: 10 $\mu m$ INFRARED SPECTRUM OF TETRAHYDROFURAN: QUENCHING OF CORIOLIS INTERACTIONS IN THE VIBRATIONALLY EXCITED STATE Creators: Andrews, Anne M.; Pate, Brooks H.; Miller, C. Cameron; Ainetschian, A.; Fraser, G. T. Issue Date: 1994 Abstract: The 2 MHz resolution infrared spectrum of the asymmetric C-O stretching band of tetrahydrofuran (THF) at $1087 cm^{-1}$ has been observed using a microwave-sideband $CO_{2}$-laser electric-resonance optothermal spectrometer. Transitions arising from ground state levels up to $V=3$ in the pseudorotation quantum number have been measured; definitive band assignments have been made for $V=0 \rightarrow V=0, V=0 \rightarrow V=1, V=1 \rightarrow V=0$ and $V=1 \rightarrow V=1$ transitions. Two additional bands are observed at higher energy which are associated with higher pseudorotation levels; although the J assignments for these bands are definitive, the excited state V assignments are not. All assignments are confirmed by microwave-infrared double resonance or precise ground-state combination differences. For all four bands, the upper-state term values are found to fit to a Watson Hamiltonian to better than 10 MHz, with a few levels not included in the fits perturbed by $> 100$ MHz. Precise microwave $\Delta V$ gaps give equally precise $\Delta V$ gaps for the C-O stretching vibration. In the absence of a third perturbing state, these measurements will furnish information on the vibrational dependence of the pseudorotation portential. URI: http://hdl.handle.net/1811/13019 Other Identifiers: 1994-FC-10