Study of the surface recombination in the production of a dense polarized hydrogen atomic beam at low temperature

Two-photon frequency comb spectroscopy of atomic hydrogen

“…This behavior is consistent with a strong increase in the hydrogen recombination coefficients for both copper and Teflon surfaces below 3.6. Fluorescence detection 60 K [55]. We do not expect a solid H 2 layer to form on the cold surfaces at any temperature except at 4.5 K, where its formation was observed in the experiment.…”

“…This is because even at 7 K, the vapor pressure of solid H 2 (2.2 × 10 −2 mbar) is much larger than the pressure inside the nozzle as determined through a simulation (8 × 10 −5 mbar). The presence of such a layer is expected to reduce recombination substantially [54,55]. However, in the experiment, the count rate at 4.5 K is well below its value at 7 K. We attribute this to the presence of a thermal gradient along the Teflon tube, which is held at nozzle temperature at one end and at room temperature at the other end.…”

Vector and tensor analyzing powers of theH1(d→Klechneva1, Carasco2, Goussev3 et al. 2006Phys. Rev. C5100View full textAdd to dashboardCite

“…The experiment was performed at the Philips injector cyclotron of the Paul Scherrer Institute (PSI) in Villigen (Switzerland). It used a polarized deuteron beam which was prepared in the PSI atomic beam ion source [19]. The source was equipped with a 30K cold atomic beam dissociator, two sextupole fields to focus (defocus) the atomic electrons from 2 H with spin up (down), a set of two strong (SF1, SF2) and one weak field radio frequency (RF) -transition units to induce the nuclear polarization, and an electron-cyclotron resonance (ECR) ionizer.…”