Shedding Light on Surfaces – Optical Spectroscopy for Surface Science
o.Univ.-Prof. Dr. Peter Zeppenfeld
Atomic Physics and Surface Science, Institute of Experimental Physics, Johannes Kepler University Linz
17:00 - 18:00 Tuesday 14 January 2014 KFU HS 5.01 I will report on “shedding light on surfaces” in the literal sense, namely, the investigation of surfaces and thin films using optical reflectance spectroscopy and photo-electron emission microscopy (PEEM).
I will demonstrate how (conceptually very simple) optical reflectance measurements, can provide valuable insight into the structure and growth of ultrathin films in straight correlation with their electronic, optical and other physical or chemical properties. Notably, optical spectroscopies can achieve sub-monolayer sensitivity and are capable of monitoring kinetic processes on surfaces in real time. While the spatial resolution in the UV-VIS range is naturally limited, microscopic information on the structure and electronic properties can be obtained from photo-emitted electrons in PEEM. Examples will be presented, in which both methods were used to study the adsorption and growth of organic molecules on surfaces.
As an outlook, I will describe how optical spectroscopy and PEEM can be combined into a single experiment, thus enabling truly parallel optical and electron spectroscopy at a local scale.
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