COMP 67 |
| We use ambient pressure photoelectron spectroscopy (HPPES) experiments carried out at beam lines 11.0.2 and 9.3.2 of the Advanced Light Source at Lawrence Berkeley National Laboratory to probe the liquid/vapor interface of aqueous solutions. Using HPPES we can obtain the composition at the surface of liquid samples in contact with vapor pressures up to several torr. The vapor phase of the experiment can include reactive components (e.g., ozone) in addition to the equilibrium vapor associated with the liquid. By varying the x-ray energy, and thus the photoelectron kinetic energy, the experimental probe depth into the solution can be varied systematically. The ion concentrations in the near surface region of pure salt solutions and salt solutions coated with an organic surfactant layer will be described. Systems that will be discussed include aqueous solutions of the potassium halide salts and aqueous solutions of sodium nitrate. Reactions of ozone with solutions of KI will also be described. Comparisons between experiments and MD simulations will be discussed. |
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Recent Advances in Studies of Molecular Processes at Interfaces
1:30 PM-5:10 PM, Sunday, August 19, 2007 BCEC -- 156A, Oral
Division of Computers in Chemistry |