As a consequence of Liouville's theorem, the momentum spread and the emittance in
charged-particle beams cannot be reduced by means of ion optics. This limits the number of …

Since the first attempts to calculate the helium ground state in the early days of Bohr-
Sommerfeld quantization, two-electron atoms have posed a series of unexpected …

Electron–ion collisions are among the most important atomic processes in ionized gases.
They comprise elastic scattering, excitation, ionization, and recombination. Theoretical …

▪ Abstract Targeted laboratory astrophysics measurements are being conducted to address
the needs of X-ray astronomy. The measurements are producing large sets of reliable …

The strengths of individual 1s2l2l'resonances for dielectronic recombination of heliumlike
iron are measured on an electron-beam ion trap using high-resolution x-ray spectroscopy …

The merged-beams technique is powerful for the experimental study of certain classes of
atomic and molecular processes that cannot be as readily or accurately addressed by other …

Energies and absolute cross sections for dielectronic recombination of lithiumlike Cu 2 6+
via ΔN= 0 and ΔN= 1 resonances have been measured at the Heidelberg heavy-ion storage …

We have measured the dielectronic recombination cross section of Se 2 5+ ions at center-of-
mass energies from 1 to 1800 eV using merged electron and ion beams in the Heidelberg …

The first observation of laser-induced recombination, performed with merged beams of
protons, electrons, and laser photons in an ion storage ring, is reported. The process was …

In a joint experimental and theoretical endeavor, photoionization of metastable C 4+(1 s 2 s
S 1 3) ions via intermediate levels with hollow, double-K-vacancy configurations 2 s 2 p, 2 s …