Extensive LEED analysis of Ni(110). III. Merits and drawbacks of the I(g) approach

For pt.II see ibid., vol.15, p.3231 (1982). A LEED analysis of the Ni(110) surface is performed using the I(g) method. This method, which utilises the relative intensities of beams at individual energies, uses much less computer time than I(E) methods. Care must be taken with the normalisation procedure and choice of comparison scheme if it is not to be adversely affected by errors in the weakest or strongest beam intensities. A criterion for comparison is found which appears to give reliable results. The I(g) method yields results similar to those obtained from I(E) methods and is more sensitive to the surface potential barrier or a step distribution and is comparable with the best r-factor for normal relaxation.