Schematic of the experiment (IMAGE) Heinrich-Heine University Duesseldorf Caption Schematic of the experiment: in an ion trap (grey), a laser wave (red) is sent onto HD+ molecular ions (yellow/red dot pairs), causing quantum jumps. These in turn cause the vibrational state of the molecular ions to change. This process corresponds to the appearance of a spectral line. The laser wavelength is measured precisely. Credit HHU/Soroosh Alighanbari Usage Restrictions No restrictions. License Public Domain 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.