# ${H_{2}}^{18}O$ ABSORPTION SPECTRA BETWEEN 9600 AND $16000 cm^{-1}$

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 Title: ${H_{2}}^{18}O$ ABSORPTION SPECTRA BETWEEN 9600 AND $16000 cm^{-1}$ Creators: Bykov, A. D.; Camy-Peyret, C.; Mandin, J.- Y.; Naumenko, O. V.; Petrova, T.; Sinitsa, L.; Scherbakov, A.; Flaud, J.- M. Issue Date: 1995 Publisher: Ohio State University Abstract: The spectrum of $^{18}O$-enriched water vapor has been recorded between 9000 and $16000 cm^{-1}$ using a Fourier-transform spectrometer with a resolution of $0.01 cm^{-1}$ and an optical path length of 434 m. The positions of more than 4350 lines have been measured with an accuracy of about $0.0005 cm^{-1}$ for strong lines and $0.005 cm^{-1}$ for weak lines. During the assignment procedure the lines of 22 bands were observed and the energy levels of the highly excited vibrational states which belong to the first and second decades, and first and second pentadecades of ${H_{2}}^{18}O$ have been determined. Investigated vibrational states $3\nu \{(121), (201), (003), (300), (041), (220), (022), (102), (140)\}, 3\nu+\delta \{(131), (211), (013), (310), (051), (230), (112), (032), (070)\}, 4\nu \{(301), (400), (103)\}$. In the energy level calculation we have taken into account the following interactions: 1. The strong bending-rotation coupling leads to the divergence of the Watson-type effective rotational Hamiltonian for vibrational states with high $\nu_{2}$ values even at moderate values of the rotational quantum numbers $K_{a}$. For this reason we used the Pade-Borel approximate $method^{1}$. 2. The vibrational states (070) and (160), (080) have been added to the first and second polyads respectively to explain the perturbations due to HEL-$resonances^{2,3}$ in highly excited vibrational states. Rotational, centrifugal distortion and resonance coupling constants have been determined. Description: $^{1}$O.L. Polyanskii, J. Mol. Spectrosc. 112, 79 (1985) $^{2}$A. Bykov, O. Naumenko, and L. Sinitsa, Atmospheric Optics, 3, 115 (1990). $^{3}$J.-Y. Mandin, J.-P. Chevillard, J.-M. Flaud, and C. Camy-Peyret, Can. J. Phys., 66, 997 (1988). Author Institution: Institute of Atmospheric Optics, Tomsk, 634055, Russia; Université P. et M. Curie, 75252 Paris Cedex 05, France URI: http://hdl.handle.net/1811/29488 Other Identifiers: 1995-MG-08