This Review presents electron affinities of atoms and structures of atomic negative ions. The
negative ion properties of many elements in the main groups of the Periodic Table were well …

Negative ions are important in many areas of science and technology, eg, in interstellar
chemistry, for accelerator-based radionuclide dating, and in anti-matter research. They are …

Laser cooling is a well-established technique for the creation of ensembles of ultracold
neutral atoms or positive ions. This ability has opened many exciting new research fields …

We propose a scheme for laser cooling of negatively charged molecules. We briefly
summarize the requirements for such laser cooling and we identify a number of potential …

We use a novel electrostatic ion storage ring to measure the radiative lifetime of the upper
level in the 3 p 5 P 2 1/2 o→ 3 p 5 P 2 3/2 o spontaneous radiative decay in S-32 to be …

The electronic structures of actinide systems are extremely complicated because of strong
electron correlations and relativistic effects. The atomic actinide anion poses even more …

The level structure of negative ions near the electron detachment limit dictates the low-
energy scattering of an electron with the parent neutral atom. We demonstrate that a single …

The bound–bound transition from the 5 d 2 6 s 2 F 2 e 3 ground state to the 5 d 6 s 2 6 p D 1
o 3 excited state in negative lanthanum has been proposed as a candidate for laser cooling …

Experiments with antihydrogen (H¯) for a study of matter-antimatter symmetry and antimatter
gravity require ultracold H¯ to reach ultimate precision. A promising path towards antiatoms …

We have used the Cryogenic Storage Ring (CSR) at the Max Planck Institute for Nuclear
Physics to study long-lived metastable states of the silicon anion. A Si− beam of 58 keV …