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Edge-defined film-fed grown polycrystalline silicon sheets, grown with one face exposed to oxidizing CO gas added to the inert Ar atmosphere, were studied. Interaction of CO with molten silicon surface during growth produced SiC-like structures in a thin layer on the surface exposed to CO. Infrared spectroscopy results suggest that this layer is constituted of good quality SiC ; however, Raman and x-ray photoelectron spectroscopy showed that it consists of Si1− xCx in the form of small crystallites mixed with C- and O-rich silicon. Journal of Applied Physics is copyrighted by The American Institute of Physics.

Oxygen-, imino-. and/or sulfur-bridged [18]annulenes are studied using the As-index of aromatic stabilization. Theoretical predictions, which indicate that these compounds should differ among themselves in their aromatic properties, correlate nicely with the available experimental findings. Unknown compounds of this class: [18]annulene imino-dioxide and [18]annulene oxide-imino-sulfide are predicted to be aromatic and good candidates for preparation. The same prediction is also reached for 1,10-diaza[18]annulene.