Intermolecular Vibration of the NMA Dimer (IMAGE) American Institute of Physics Caption The hydrogen-bonding interaction causes the atoms on each individual N-methylacetamide molecule to vibrate in unison. Credit L. De Marco/UChicago 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.