AVS 47th International Symposium
    Surface Science Tuesday Sessions
       Session SS1-TuM

Paper SS1-TuM9
Reactivity of Water toward NaCl(100)

Tuesday, October 3, 2000, 11:00 am, Room 208

Session: Reactions on Oxides and Environmental Chemistry
Presenter: A.J. Leavitt, State University of West Georgia
Authors: A.J. Leavitt, State University of West Georgia
R.D. Huffstetler, Jr., State University of West Georgia
J.W. Russell, State University of West Georgia
J.I. Brauer, State University of West Georgia
J.K. Cutchins, State University of West Georgia
C.D. Lane, State University of West Georgia
M.B. Reddy, State University of West Georgia
F.A. Khan, State University of West Georgia
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The role of water-mediated reactions that occur on particulate NaCl surfaces is relevant to atmospheric chemistry. A temperature-programmed desorption (TPD) study of water adsorbed onto NaCl(100) was performed. Water was adsorbed onto the surface held at a temperature of 130 K at a variety of water fluences, then thermally desorbed into a quadrupole mass spectrometer in an ultrahigh vacuum chamber. Water molecularly adsorbs onto the surface and desorbs in a first-order process at ~143 K for fluences corresponding to 10% of a monolayer. As the water fluence is increased, the temperatures of maximum desorption shifts higher suggesting stabilization of the water layer through hydrogen bonding. Further increases in water fluences lead to a constant area under the desorbing peak suggesting the buildup of a condensed layer of the water on the NaCl surface. This desorption feature does not appear to saturate at very high fluences of water. These results are consistent with previous work by Falsch and Henzler (UPS study) and Peters and Ewing (IR study). This work was supported by Research Corporation.