The Water Dimer Investigated in the 2OH Spectral Range Using Cavity Ring-Down Spectroscopy.
Two setups based on CW cavity ring-down spectroscopy were used at Bruxelles and Rennes to record jet-cooled water dimer absorption between 7188 and 7285, and between 7357 and 7386 cm(-1). Some 19 absorption features are reported, significantly more than in the literature. Limited high-resolution information is available due to strong overlap between neighboring vibration-rotation-tunneling (VRT) structures and to spectral broadening induced by short upper state vibrational predissociation lifetimes, likely to range between 100 and 20 ps. Rotational band contours analyses are performed to assign the partly resolved VRT structures to the v1v2v3,vfvb = 000,11; 200,00; 000,20; and 101,00 zero-order vibrational states. Their wavenumbers are found to be 7192.34, 7225.86, 7240.57, and 7256.99 cm(-1), respectively. Both so-called acceptor-switching tunneling components are involved in the assignments whose tentative character is discussed.
Institut de Physique de Rennes, UMR 6251, Campus de Beaulieu, Bât. 11C, Université de Rennes 1/CNRS , F-35042 Rennes Cedex, France.
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Suas-David
Laboratoire de Chimie quantique et Photophysique, CP160/09 Faculté des Sciences, Université Libre de Bruxelles , 50, ave. Roosevelt, B-1050 Bruxelles, Belgium.
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Vanfleteren
Laboratoire de Chimie quantique et Photophysique, CP160/09 Faculté des Sciences, Université Libre de Bruxelles , 50, ave. Roosevelt, B-1050 Bruxelles, Belgium.
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Földes
Laboratoire Interdisciplinaire de Physique, UMR 5588, Université de Grenoble Alpes/CNRS , F-38041 Grenoble, France.
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Kassi
Institut de Physique de Rennes, UMR 6251, Campus de Beaulieu, Bât. 11C, Université de Rennes 1/CNRS , F-35042 Rennes Cedex, France.
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Georges
Laboratoire de Chimie quantique et Photophysique, CP160/09 Faculté des Sciences, Université Libre de Bruxelles , 50, ave. Roosevelt, B-1050 Bruxelles, Belgium.
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Herman