Bose–Einstein condensation of metastable helium in a bi-planar quadrupole Ioffe configuration trap

Feshbach resonances inHe3*-Goosen1, Tiecke2, Vassen3 et al. 2010Phys. Rev. A142320View full textAdd to dashboardCite

“…This is a significant shift but still smaller than the uncertainties in the binding energies caused by the errors as given in Eq. (8). Therefore, the limiting factor in the present calculations is the inaccurately known short-range potentials rather than the approximation of using only real potentials.…”

“…Until now we have neglected these imaginary terms; however, to calculate the binding energies we use the scattering lengths [Eq. (8)] which are based on the full optical potentials. Therefore, this procedure accounts partly for the inaccuracy in the binding energies induced by using a real scattering potential.…”

“…We investigate the possibilities to modify collision properties of mixtures of He * atoms in magnetic or optical dipole traps. Bose-Einstein condensation (BEC) of 4 He * atoms has been realized by several groups [5][6][7][8][9]. This metastable isotope of helium has no nuclear spin and is magnetically trappable in the fully stretched |s,m s = |1,+1 state, where s and m s are the electronic spin and magnetic quantum numbers respectively.…”

Observation of atomic speckle and Hanbury Brown–Twiss correlations in guided matter waves

“…To prepare atoms in the guide, He* atoms are initially pre-cooled to just above the BEC transition temperature, T c , in a BiQUIC magnetic trap 22 before being transferred into the dipole potential, at which a condensate fraction is formed. To release atoms into the guide, the laser intensity is reduced until the atoms are no longer held against gravity in the weak axis of the trap, at which point they fall and are guided by the transverse confinement of the dipole potential.…”

Heteronuclear collisions between laser-cooled metastable neon atoms

“…Since direct detection of the collision products (using electron multipliers) as well as of the remaining Rg* atoms is possible with high efficiency, detailed studies of homonuclear ionizing collisions have been carried out for all rare gas elements (see [1] for an overview). Additional motivation for these investigations arises from the fact, that favorable rate coefficients for inelastic but also for elastic collisions are essential for the achievement of quantum degeneracy which for Rg* atoms so far has only been demonstrated for 4 He [5][6][7][8] and 3 He [9]. For unpolarized Rg* samples, two-body loss rate coefficients for PI [10] between β = 6 × 10 −11 cm 3 /s for 132 Xe [11] and β = 1 × 10 −9 cm 3 /s for 22 Ne [12] have been measured.…”