The 2ν2, ν1 and ν3 bands of D216O. The ground state (000) and the triad of interacting states {(020), (100), (001)}

Three spectra of D₂¹⁶O between 2170 and 3090 cm^?1 have been recorded with a Fourier transform spectrometer having a resolution of about 5 × 10^?3 cm^?1. A careful analysis of the bands 2ν₂, ν₁, and ν₃ has led to a largely extended and more precise set of rotational levels belonging to the vibrational states (000), (020), (100), and (001). From this set, we have then been able to determine improved rotational constants for the ground state (000) and precise vibrational energies, rotational and coupling constants for the three interacting states (020), (100), and (001). The Fermi-type interaction between (020) and (100) as well as the Coriolis-type interactions between (100) and (001) and between (020) and (001) have been explicitly taken into account. Many vibrorotational resonances were detected and are discussed.     

Strengths of H2O lines in the 5000–5750 cm-1 region

Measurements of the strengths of 311 lines of water vapor have been made with high resolution in the region 5000–5750 cm^-1. The strength data of lines in the (011) and (110) bands are analyzed to determine the band strengths and the coefficients of the F factors. The band strengths of the (011) and (110) bands were found to be 20.65±0.21 and 0.384±0.015 cm^-2atm^-1 at 296 K, respectively. Many of the measured strengths in the (011) and (110) bands differ from the calculated values because of strong Coriolis interactions. Also included in the present work are measurements of strengths of four lines in the (030) band and 36 lines in the “hot” band (021)-(010).     

High resolution infrared spectrum of the ν2 + ν3 and ν1 + ν2 bands of ozone

The vibration-rotation bands ν₁ + ν₂ and ν₂ + ν₃ of ozone appearing in the 5.7 μm region have been recorded at a resolution of 0.019 cm^?1 with a SISAM spectrometer. The rotational levels of the (110) and (011) vibrational states have been fitted using a Hamiltonian which takes into account the Coriolis interaction between these two states. The rotational and coupling constants deduced from this study have been used to calculate a list of the vibration-rotation lines which is of interest for high resolution studies of atmospheric spectra in the 1670–1890 cm^?1 region.     

Line positions and intensities for the ν1 + ν2 and ν2 + ν3 bands of H2O

The intensities of about 90 lines of the ν₁ + ν₂ and ν₂ + ν₃ bands of H₂¹⁸O have been measured using a Fourier transform spectrum of natural water vapor. The constants involved in the rotational expansion of the transformed transition moment operators corresponding to these bands have been determined through a fit of these line intensities. The constants obtained are used to compute the whole spectrum of the ν₁ + ν₂ and ν₂ + ν₃ bands of H₂¹⁸O providing reliable line positions and intensities. For lines involving perturbed levels a comparison is given with the results obtained for H₂¹⁶O and it is shown that the results for one isotopic species cannot be transferred directly to another one.     

High-resolution infrared and microwave study of 10BF2 OH and 11BF2OH: the 5, 6l, 71, 8l, 91 and 81 91 vibrationally excited states

Abstract

High-resolution (≤2.4×10^?3cm^?1) Fourier transform infrared spectra of gas-phase ¹⁰B-enriched isotopic and natural samples of BF₂OH (difluoroboric acid) were recorded in the 400–4000 cm^?1 spectral range. Starting from the results of a previous study [Collet, D., Perrin, A., Burger, H., and Flaud, J.-M., 2002, J. Molec. Spectrosc. 212, 118], which involved the v ₈ ¹⁰BF₂ out-of-plane bending) and v₉ (OH torsion) bands of ¹¹BF₂OH, it has been possible to perform the first rovibrational analysis of the v ₅ ¹⁰BF₂ bending), v ₈ , v ₉ and v ₈+v ₉ bands of’¹¹BF₂OH, and of the v ₇ (F₂BO in-plane bending), v ₅, and v ₈+v₉ bands of ¹¹BF₂OH up to very high rotational quantum numbers. In addition, microwave transitions within the 5¹, 6¹, 7¹ and 8¹ vibrational states of ¹¹BF₂OH were measured using predictions from ab initio calculations [Breidung, J., Demaison, J., D'Eu, J.-F., Margules, L., Collet, D., Mkadmi, E. B., Perrtn, A., And Thiel, W., 2004, J. Mol. S ectrosc. (in press)]. The v ₅, v ₈, v ₉ and v ₈+v ₉ bands of’ bands of ¹⁰BF₂OH and the v ₈+v ₉ band of'BF₂OH are not significantly affected by ptrturbations, and the experimental 5¹, 8¹ and 9¹ of ¹⁰BF₂OH and the 8¹9¹ energy levels of BF20H and ¹⁰BF₂OH could be reproduced using a simple Watson-type Hamiltonian. For the v ₅ and v ₇ bands of ¹¹BF₂OH, C-type Coriolis interactions coupling the 5¹ and 7¹ energy levels with those of the 7² and 6¹ dark states, respectively, were accounted for in the calculation. In addition, an updated set of rotational parameters was provided for the unperturbed 8¹ and 9¹ vibrational states of ¹¹BF₂OH using the data from our previous analysis. In all these cases, the upper state parameters derived in this work enabled the reproduction of both the infrared and microwave data to within experimental uncertainties.     

The 2v 2, v 1 and v 3 bands of H2 16O

The 2v ₂, v ₁ and v ₃ bands of H₂ ¹⁶O occurring in the region 2930–4255 cm^-1 were studied from a spectrum recorded with a high resolution Fourier transform spectrometer (resolution: 0·005 cm^-1). The set of the observed transitions leads by a least squares method to the determination of very accurate values of the rotational levels belonging to the vibrational states (000), (020), (100), (001). From these levels, using Watson's Hamiltonian, we have obtained respectively 21 and 17 rotational constants for the states (000) and (020).     

High-Resolution Infrared, Microwave, and Submillimeter-Wave Study of FClO(2) in the nu(2), nu(3), nu(4), and nu(6) Excited States

A high-resolution analysis of the {nu(2), nu(3)} and {nu(4), nu(6)} bands of the two isotopomers of chloryl fluoride F(35)ClO(2) and F(37)ClO(2) has been carried out for the first time using simultaneously infrared spectra recorded around 16&mgr;m and 26&mgr;m with a resolution of ca. 0.003 cm(-1) and microwave and submillimeter-wave transitions occurring within the vibrational states 2(1), 3(1), 4(1), and 6(1). Taking into account the Coriolis resonances which link the rotational levels of the {2(1), 3(1)} and the {4(1), 6(1)} interacting states, it was possible to reproduce very satisfactorily the observed transitions and to determine accurate vibrational energies and rotational constants for the upper states 2(1), 3(1), 4(1), and 6(1) of both the (35)Cl and (37)Cl isotopic species. Copyright 2001 Academic Press.