One can attach and detach single electron charges to molecules and atoms using the microscope tip [Ref]. Using Kelvin probe force microscopy, we detect atomic charge states [Ref] and molecular charge distributions [Ref].
We are interested in controlling and measuring single electron charge transfer between molecules [Ref] and ultimately within molecule–metal networks on surfaces. Recently we measured the reorganization energy upon charging a single molecule on an insulator. For this we used the AFM as a single-electron current meter [Ref].
Moreover, we study the minute changes in the molecular structure, related to different charge states. The structural and functional changes of charged molecules are important in catalysis, electrochemistry, photoconversion and charge transfer [Ref].
Structure elucidation with Charge control [Ref].
Prophine, the parent compound of hemoglobin and chlorophyll, imaged in three different charge states: neutral (F0), negative (F-1) and doubly negative (F-2). [Ref].