Scanning Quantum Dot Micrograph (IMAGE) Forschungszentrum Juelich Caption Left: The scanning quantum dot micrograph of a PTCDA molecule reveals the negative partial charges at the ends of the molecule as well as the positive partial charges in the center. Center: Simulated electric potential above a PTCDA molecule with molecular structure. Right: Schematic of charge distribution in the PTCDA molecule. Credit Copyright: Forschungszentrum Juelich Usage Restrictions Please use only in conjunction with reports related to Forschungszentrum Juelich. Please give credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.