Infrared Spectroscopy and Structure of $H_{2}O$ Physisorbed onto NaCl(100).
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Date
1995
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Ohio State University
Abstract
Our study is motivated by the importance of salt aerosols in the earth's atmosphere. $10^{9}$ to $10^{10}$ metric tons of NaCl are released into the atmosphere by the oceans $annually^{1}$. The presence of $H_{2}O$ at the surface of these crystallites is believed to effect heterogeneous chemistry that may occur on these particles. The infrared absorption spectrum of $H_{2}O$ physisorbed to NaCl(100) was obtained at ambient temperatures and water vapor pressures that mimic tropospheric conditions. Spectra in the $3400 cm^{-1}$ region indicate that $H_{2}O$ molecules are adsorbed with little lateral interaction. Above this pressure islands form with the adjacent molecules strongly attracted to one another through intermolecular hydrogen bonds. The adsorption of water is found to be reversible below 15 mbar. This research is sponsored by the National Science Foundation, grant # ATM93-03058.
Description
1. J.M. Prospero, R.J. Charlson, V. Mohnen, R. Jaenicke, A.C. Delany, J. Moyers, W. Zoller, and K. Rahn, Rev. Geophysics and Space Physics, 21 (1983) 1607.
Author Institution: Indiana University, Bloomington, IN 47405
Author Institution: Indiana University, Bloomington, IN 47405