6,793 research outputs found
Laser Cooling of 85Rb Atoms to the Recoil Temperature Limit
We demonstrate the laser cooling of 85Rb atoms in a two-dimensional optical
lattice. We follow the two-step degenerate Raman sideband cooling scheme
[Kerman et al., Phys. Rev. Lett. 84, 439 (2000)], where a fast cooling of atoms
to an auxiliary state is followed by a slow cooling to a dark state. This
method has the advantage of independent control of the heating rate and cooling
rate from the optical pumping beam. We operate the lattice at a Lamb-Dicke
parameter eta=0.45 and show the cooling of spin-polarized 85Rb atoms to the
recoil temperature in both dimension within 2.4 ms with the aid of adiabatic
cooling
Ethyl (2E,4Z)-5-diethylamino-2-(phenylsulfonyl)penta-2,4-dienoate
In the title compound, C17H23NO4S, the pentadiene group adopts a planar conformation, with an r.m.s. deviation of 0.0410 (14) Å. The phenyl ring makes a dihedral angle of 85.73 (11)° with the pentadiene group, while the pentadiene group makes dihedral angles of 11.38 (11) and 14.08 (10)°, respectively, with the amino and ester groups. In the crystal, molecules are linked via pairs of C—H⋯O interactions, forming inversion dimers
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