Momentum Dependence of Excitation Energy (IMAGE) Hiroshima University Caption Black dots�Eš show energy of acoustic mode obtained from IXS experiments The dashed line (blue)� shows the energy of the acoustic mode given by the chain model shown in Fig. 2(a) The solid line (red)�Eš shows energy of the acoustic mode given by the chain model shown in Fig. 2(b) Credit M. Inui, Graduate School of Integrated Arts and Sciences, Hiroshima University, et al. Usage Restrictions This image may only be used with appropriate caption and 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.