응용 표면 물리 실험실은 고체 표면 원자의 구조와 원자의 운동, 표면의 전기적 및 화학적 성질, 표면상에서 흡착 원자 및 흡착 분자의 거동 등에 관하여 연구를 진행하고 있다. 또한, 국외는 물론이고 국내의 여러 저녈과 학회에 수 많은 논문을 게재하고 있는 실험실이다. 그외에도 산업체 전반의 폭넓게 응용되고 있는 고진공(high vacuum) 시스템과 고체의 표면 연구에 필수적인 초고진공(ultra high vacuum)시스템의 구성 방법과 각 장치들의 작동원리와 특성등 진공 시스템의 구성과 운용에 필요한 기술 전반에 대한 많은 노하우를 지니고 있어, 표면 분석에 기반을 마련하고 있는 실험실이다.
1. LEISS (Low-Energy Ion Scattering Spectroscopy)
If a beam of ions is directed at a sample surface, then a certain number will be elastically reflected. The intensity of the scattered ions as a function of angle of emission provides information regarding the surface rystallographic structure. The variation in the intensity of the scattered beam is partly due to shadowing of substrate atoms by adsorbed atoms. By use of scattering theory, knowledge the sites that the surface atoms occupy can be derived. This knowledge is complicated by incompletely understood charge neutralisation effects which are important for incident energies below 5keV. Hence for MEIS this is not a problem. The bombarding species in ISS is frequently He+.ISS often refers to low energy ion scattering (LEIS) , but can also encompass higher energy forms such as MEIS, HEIS and RBS.
2. FEM (Field Emission Microscopy)
The field emission microscope was invented by Erwin Mueller in 1936. This instrument approached, for the first time, to view a surface on a scale of atomic dimensions and yet simultaneously allowed one to follow rapid changes at the surface. In its simplest form, FEM consit of a shap needle emitter and a fluorecent screen as shown in picture. By appling negative field to the emitter, electrons are emitted from the surface of the emitter to the direction of the screen. The image contrast appears due to the difference in current densities of electron, which originated from the difference in work functions and electric field on the emitter surface (Fowler-Nordheim relation).
