Differential Charging in Photoemission from Mercurated DNA Monolayers on Ferromagnetic Films.

ABSTRACT: Spin-dependent and enantioselective electron-molecule scattering occurs in photoelectron transmission through chiral molecular films. This spin selectivity leads to electron spin filtering by molecular helices, with increasing magnitude concomitant with increasing numbers of helical turns. Using ultraviolet photoelectron spectroscopy, we measured spin-selective surface charging accompanying photoemission from ferromagnetic substrates functionalized with monolayers of mercurated DNA hairpins that constitute only one helical turn. Mercury ions bind specifically at thymine-thymine mismatches within self-hybridized single-stranded DNA, enabling precise control over the number and position of Hg²⁺ along the helical axis. Differential charging of the organic layers, manifested

SUBMITTER: Stemer DM 

PROVIDER: S-EPMC7058983 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature