RHYS LEWIS, AHS, DECD, UNISA / ANIMATE4.COM / SCIENCE PHOTO LIBRARY RHYS LEWIS, AHS, DECD, UNISA / ANIMATE4.COM / SCIENCE PHOTO LIBRARY
Rubidium-caesium spectroscopy, animation. The electromagnetic radiation emitted by excited atoms and ions of a chemical element or molecule produce a characteristic spectrum. Such spectra are used to identify chemical elements, both in the laboratory and in distant stars. Here, aqueous ions of caesium (Cs+, left) and rubidium (Rb+, right) are producing characteristic purple-blue and red colours in a flame test, with the resulting emission spectra also shown. This was the method used by Bunsen and Kirchhoff to discover the elements rubidium (1861) and caesium (1860) using spectroscopy.
Model release not required. Property release not required.