The Water Dimer Investigated in the 2OH Spectral Range Using Cavity Ring-Down Spectroscopy

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• 作者：N. Suas-David ; T. Vanfleteren ; T. F枚ldes ; S. Kassi ; R. Georges ; M. Herman
• 刊名：Journal of Physical Chemistry A
• 出版年：2015
• 出版时间：October 1, 2015
• 年：2015
• 卷：119
• 期：39
• 页码：10022-10034
• 全文大小：622K
• ISSN：1520-5215

文摘

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<sup>鈥?sup>. 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 v<sub>1sub>v<sub>2sub>v<sub>3sub>,v<sub>fsub>v<sub>bsub> = 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<sup>鈥?sup>, respectively. Both so-called acceptor-switching tunneling components are involved in the assignments whose tentative character is discussed.