O II Stark broadening parameters (Mahmoudi+, 2005)
O III recombination coefficients (Kisielius+, 1999)
O IV radiative and excitation rates (Aggarwal+, 2008)
o-Positronium scattering off H and He
Obituary: Donald Edward Osterbrock, 1924-2007
Obituary: Michael John Seaton, 1923-2007
Obituary: Thomas Michael Donahue, 1921-2004
Observability of atomic line features in strong magnetic fields
Observation and absolute frequency measurements of the 1S0 - 3P0 optical clock transition in ytterbium
Observation and cancellation of the dc Stark shift in strontium optical lattice clocks
Observation of a Cooperative Radiation Force in the Presence of Disorder
Observation of a Large Atomic Parity Violation Effect in Ytterbium
Observation of a resonant four-body interaction in cold cesium Rydberg atoms
Observation of absorptive photon switching by quantum interference
Observation of atom wave phase shifts induced by van der Waals atom-surface interactions
Observation of atomic localization using Electromagnetically Induced Transparency
Observation of Caustics in the Trajectories of Cold Atoms in a Linear Magnetic Potential
Observation of coherence revival and fidelity saturation in a delta-kicked rotor potential
Observation of coherent transients in ultrashort chirped excitation of an undamped two-level system
Observation of Cold Collisions between Trapped Ions and Trapped Atoms