Interaction photon-stimulated surface

The photon-stimulated surface interactions are often divided... 

Last, but not least, we have to consider the following question To what extent does the process of photoemission influence the surface phenomena under investigation The most important processes to be considered in this context are the creation of defect centers in semiconductors and insulators and photon stimulated desorption (PSD). As pointed out above the photoemission process ends up in a one-hole final state. This highly excited state may decay in a number of different ways, which sometimes involve repulsive interaction between the excited particle and the surface. In this case desorption of both neutral species... 

Laser-induced reaction has been widely used to stimulate gas-surface interaction. Lasers are also used to probe molecular dynamics in heterogeneous systems as well. In the applied area, the laser photochemical techniques are successfully applied to produce well defined microstructures and new materials for microelectronic devices (1). Enhanced adsorption and chemical reaction on surfaces can be achieved by a photoexcitation of gaseous molecules, adsorbed species as well as solid substrates. The modes of the excitation include vibrational and electronic states of the gaseous species and of the adsorbates surface complexes. Both a single and a multiple photon absorption may be involved in the excitation process. 

Vibrationally excited processes can be applied in the formation of semiconductor films. One of the examples to demonstrate the photoenhanced chemisorption and reaction due to the vibrational excitation is the interaction of SF molecules with silicon (2). In this case, SFg molecules can be chemically activated by multiple photon absorption of CO2 laser either in the gas phase or in the adsorbed state. Deposition of Si on quartz or glass surface can also be stimulated by the decomposition of SiH enhanced by the irradiation of CO2 laser to the gas phase (3). 

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