Au20 Absorption Data (image) American Institute of Physics Share Print E-Mail Caption The researchers found that excitation within the entire UV-to-visible range leads to intense and sharp fluorescence at a wavelength of 739.2 nm (1.68 eV). Credit Brune Usage Restrictions This image may be used only with appropriate credit. 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.