RAS and STM investigations of pentacene molecules on metal and semiconductor surfaces

TL;DRAbstract

In this study the electronic surface states and surface reconstructions of an organic molecule on semiconductor and metal surfaces were investigated with Reflectance Anisotropy Spectroscopy (RAS), Scanning Tunnelling Microscopy (STM) and photoemission techniques.
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\nThe design, construction and operation of a Reflectance Anisotropy Spectrometer are described in detail. The RAS technique was applied to the investigation o f pentacene on the Au(110)-(2xl) surface. It was found that the pentacene molecules adsorbed on this surface shows three observable electronic transitions in the 1.6 eV-5 eV photon energy range. At monolayer coverage there are distinct changes in the RAS spectrum that can be associated with a change in the orientation of the molecule on the gold surface.
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\nSTM was applied to the investigation o f pentacene adsorbed on the Au(llO)- (2x1) and the A g /S i(lll)-(7 x 7 ) surface. It was found that on the Au(l 10)-(2xl) surface, below a monolayer the pe

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