Free-electron-like dispersion in an organic monolayer film on a metal substrate

Article Abstract:

Scanning tunneling spectroscopy observations of an organic monolayer film on a silver substrate reveal a completely delocalized two-dimensional band state that is characterized by a metal-like parabolic dispersion with an effective mass of m* = 0.47 [m.sub.e], where [m.sub.e] is the bare electron mass. The dispersion is far stronger than expected for the organic film alone and arises as a result of strong substrate-mediated coupling between the molecules within the monolayer.

Germany, Observations, Optical properties, Monomolecular films, Scanning tunneling microscopy, Silver compounds

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Organic crystals at large

Article Abstract:

A method for nucleating and growing single-crystal organic semiconductors over electrodes on arbitrary substrates, which produce extended arrays of high-performance electronic transistors, is described. This described method represents a step towards practical applications of high-quality but fragile, single crystals of organic semiconductors and could pave the way to high-performance electronic devices extending over large and flexible surfaces.

Organic semiconductors, Semiconductor wafers, Chemical properties

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Recognition of DNA damage by the Rad4 nucleotide excision repair protein

Article Abstract:

The crystal structure of the yeast xeroderma pigmentosum C (XPC) orthologue Rad4 bound to DNA containing a cyclobutane pyrimidine dimer (CPD) lesion is investigated. Results show that the lesions recognized by Rad4/XPC have thermodynamically destabilized the Watson-Crick double helix in a manner that facilitates the flipping-out of two base pairs.

DNA damage, Xeroderma pigmentosum

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