J-coupling Spectra in Zero Magnetic Field (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption A molecule of parahydrogen hydrogenates a styrene molecule to form ethylbenzene. J-coupling reveals the position and orientation of the hydrogen atoms and the carbon-13 atoms to which they bond. The upper panel shows a simulated spectrum, in blue, of coupling between a hydrogen and a carbon in the methyl position. The actual experimental data are in white. The lower panel shows simulation of coupling in the methylene position, in green, with actual data in white. Simulation and experiment are in close agreement, indicating the promise of the zero-field technique for chemical fingerprinting. Credit Pines and Budker groups, Lawrence Berkeley National Laboratory Usage Restrictions None 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.