Abstract
AbstractTwo‐dimensional electron momentum distributions (EMD) mapping in a (c‐a) plane of molecular trans‐stilbene crystal have been made, using the two‐dimensional angular correlation of positron annihilation radiation (2D‐ACAR) at room temperature (RT), 210 K and 110 K. Further, we discuss the changes in static and dynamic electron momentum distribution and the positron behavior in molecular crystals at different temperatures to clarify their static and dynamic origin. An attempt has been made to visualize the electronic structure of organic molecular crystal trans‐stilbene during phase transition. The mapped EMD is explained with the combination of disordered to ordered transition concept and molecular vibration freezing model. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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