Charge Exchange Collisions Involving Multielectron Atoms (Lithium and Sodium)

Charge exchange in relativistic heavy ion collisions

Elastic charge-exchange in relativistic heavy ion collisions is responsible for the non-disruptive change of the charge state of the nuclei. We show that it can be reliably calculated within the eikonal approximation for the reaction part. The formalism is applied to the charge-pickup cross sections of 158 GeV/nucleon Pb projectiles on several targets. The relative contributions of pionand rho-...

Spin-exchange collisions of submerged shell atoms below 1 Kelvin.

Angular momentum changing collisions can be suppressed in atoms whose valence electrons are submerged beneath filled shells of higher principle quantum number. To determine whether spin-exchange collisions are suppressed in these "submerged shell" atoms, we measured collisional rates for six hyperfine states of Mn at T < 1 K. Although the 3d valence electrons in Mn are submerged beneath a fille...

Spin - Exchange Collisions of Submerged Shell Atoms Below

Polarization in Collisions between Ultra-cold Sodium Atoms

We have studied polarization effects in the photoassociation of two colliding ultra-cold Naatoms. In a first step the two colliding atoms absorb a laser photon to associate to a singly excited molecule in a bound state of the 0−g or 1g potential. In a second step the excited molecule absorbs a second photon and is further excited to a bound level in a doubly excited potential (0−u or 1u which a...

Anisotropic relaxation in spin-exchange collisions of alkali atoms

Spin-exchange optical pumping [1] uses spin-exchange collisions between He atoms and optically pumped Rb atoms to produce large quantities of highly spin-polarized He for a variety of applications, including medical imaging [2] and spin-polarized targets [3]. The efficiency of polarized He production is determined by two fundamental rates: the Rb-He spin-exchange rate and the Rb spinrelaxation ...