Data Evaluation

After the experiment you should have saved different images of the graphite surface and at least three I/z curves. For evaluating purposes, the STM software has been installed in the microcomputer room. The software provides you with tools to determine distances, angles, etc. Describe and print every image you have taken during the experiment. If you describe macroscopic features (steps, islands), calculate their size and height and discuss the results. On the atomic scale, locate the positions of the carbon atoms and measure all important distances and angles in the unit cell. Discuss your results.

For evaluating the I/z curves you have to export them as ``Plotfile ASCII''. These files can be further processed with any program which is capable of linear regression (XMGR, EXCEL, GNUPLOT, ORIGIN). Calculate logarithmic plots of ln(I) vs. z and determine the slopes of these curves. Compare these slopes with values calculated by means of eqn. 5. Use work functions of 5.65 eV and 5.0 eV for platinum and graphite, respectively.

For printing your results, it is suggested that you use the laserprinters at the ZEDAT which are accessible from the MC room.