Ker-Jar Song (L327)
The Surface Nonlinear Optical Spectroscopy Laboratory develops and utilizes nonlinear optical techniques to investigate the surfaces and interfaces that are inaccessable using conventional techniques requiring a vacuum environment. Recent efforts have focused on (1) the influence of various salt on the surface structure of water solution and (2) microscopic spatial distribution of electrons screening an external dynamic field at the surface of thin metal films.
The growth mode and morphology of ultrathin metal films is another area of relevant interest, particularly factors capable of influencing or controlling the morphology. These studies are undertaken under an ultrahigh vacuum environment using conventional surface science techniques such as Auger spectroscopy, low energy electron diffraction, temperature programmed thermal desorption and work function measurement. The ability to perform most of the measurements while the sample is heated in a program controlled manner allows us to closely monitor the details of the surface while it undergoes morphological changes.