Second harmonic optical activity of tryptophan derivatives adsorbed at the air/water interface

Article Abstract:

Optical activity in second harmonic reflection from the air/water interface of solutions of simple tryptophan (trp) derivatives has been investigated. This indicates that second harmonic optical activity is sensitive to structural effects such as conformational and orientational distributions of trp residues at the interface.

Water chemistry, Tryptophan

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Photooxidation of hydrogen-terminated Si(111) surfaces studied by optical second harmonic generation

Article Abstract:

Photooxidation of hydrogen-terminated Si(111) surfaces in air is studied by using optical second harmonic generation (SHG) in reflection from the silicon surface. A pronounced nonmonotonic variation of the SHG signal is observed during photooxidation and also during oxidation of Si(111)-H surfaces in air in the dark.

Industrial inorganic chemicals, not elsewhere classified, Silicon, Methods, Analysis, Oxidation-reduction reaction, Oxidation-reduction reactions, Chemical properties, Harmonic functions

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Second harmonic generation at chemically modified Si(111) surfaces

Article Abstract:

Si(111) surfaces with covalently attached monolayers are investigated by optical second harmonic generation. The result indicates that second harmonic generation could be used as an in situ probe of chemical reactions on passivated Si(111) surfaces.

Silicon & Inorganic Compounds, Chemical bonds, Silicon compounds

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