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Illustration of the ion trap used by the ISOLDE team to measure the electron affinity of chlorine. In the trap, chlorine anions are reflected back and forth between two electrostatic ion mirrors, allowing the laser beam (pink) to probe the anions for much longer than in conventional measurements. The laser frequency is tuned to find the exact photon energy above which the extra electron (small white circle) is removed from the anion. Image depicting elements on playing cards overlayed over a representation of the periodic table. A group of five people (two women and three men) stand next to a large, spherical scientific machine. Two people surrounded by a large aluminum sphere with dozens of cables. Two people in safety glasses hold glass beakers containing ball-and-stick models of nobelium molecules. They are surrounded by lab equipment that includes wires, foil-wrapped cables, metal apparatuses, and a computer screen showing data. Images of molecules are projected on the ceiling panels. A group of people standing in front of a piece of scientific equipment.