Movie of 3-D Image of a Gold Nanocrystal 110 Picoseconds after Excitation with a Laser (video) University College London Share Print E-Mail Loading video... Caption The acoustic phonons can be visualized on the surface as regions of contraction (blue) and expansion (red). The diameter of the nanocrystal is 350 nanometers. Credit Jesse Clark/UCL Usage Restrictions None Share Print E-Mail 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.