Terbium Light Emission (IMAGE) National Institutes of Natural Sciences Caption This graph shows changes in the terbium light emission spectrum as a parameter of electron temperature. The peaks with the wavelength of 7.023 nanometer and 6.852 nanometer correspond to Tb36+ and Tb18+ ions, respectively. Credit Chihiro Suzuki 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.