Abstract
The adsorption kinetics of nine alkynols and four other related compounds on iron in H 2SO 4 were examined by in situ time-resolved automatic ellipsometry. The time, concentration and potential dependences of the adsorption, the subsequent orientation transition and polymer growth of the adsorbed layers formed by these compounds were determined. A new method based upon the Lorentz-Lorenz equation is deduced for the calculation of surface packing density of an adsorbed organic compound with a certain orientation on an electrode surface from ellipsometric data. Using this method, useful correlation between the molecular structure and the saturated surface packing density is obtained. In addition, the polarizabilities of an organic compound with different orientations on the surface are also obtained.
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