STM/STS Study of Electron Density of States at the Bases Sites in the DNA Alternating Copolymers

Abstract

Abstract Local electron density of state spectra at the bases sites in the two types (A–T pairs only and G–C pairs only) of double-stranded DNA molecules is measured with the use of STM/STS (scanning tunneling microscopy/scanning tunneling spectroscopy) technique. The difference of electronic structure between A–T pairs and G–C pairs is discussed in relation to the charge-transfer mechanisms in these molecules.