Surface three-body recombination in spin-polarized atomic hydrogen

\u3cp\u3eWe calculate the surface dipolar recombination rate Ls for spin-polarized hydrogen adsorbed on He4 surfaces at temperatures in the 0.2- to 0.6-K regime and for magnetic fields up to 30 T. For a magnetic field of 7.6 T normal to the surface and 0.4 K we find Ls=1.3(3)×10-25 cm4 s-1 increasing by 10%/T in the range of experimental interest. The anisotropy with the direction of the magnetic field is considerably smaller than in the case of the surface dipolar relaxation.\u3c/p\u3

Bright thermal atomic beams by laser cooling::a 1400-fold gain in beam flux

Using a three-step transverse laser cooling scheme, a strongly diverging flow of metastable Ne(3 s 3 P 2] atoms is compressed into a well-collimated, small diameter atomic beam (e.g., 1.4 mrad HWHM divergence at 3.6 mm beam diameter) with an unmodified axial velocity distribution centered at 580 m/s. The maximum increase in beam flux 1.04 m downstream of the source is a factor 1400; the maximum increase in phase space density, i.e., brightness, is a factor 160. The laser power used is only 140 mW. The scheme is extendable to a large variety of atomic species and enables the application of bright atomic beams in many areas of physics

Polarization effects in the ionization cross section for collisions of Ne**{(2p)5(3p);J = 3} with Ar : a sensitive probe for locking phenomena [Errata, Phys.Rev.Lett., 62,2369(1989)]

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