Quantifying Electric Dipole Moment of Single Chlorine Atom Adsorbed on Ag(111) with Scanning Quantum Dot Microscopy

Abstract Halogen‐metal interactions are fundamental to applications in heterogeneous catalysis and microelectronics, yet their atomic‐level mechanisms remain incompletely understood due to the complex nature of these interactions, which range from chemisorbed species to the formation of surface halides. Herein, scanning quantum dot microscopy, a novel technique that provides high‐resolution imaging of the electrostatic potential of individual adatoms, is employed to quantify the surface dipole moment of chlorine on Ag(111). The measurements reveal a dipole moment of −0.85 Debye, consistent with values derived from work function data, providing new insights into charge redistribution at halogen‐metal interfaces.