In proton-krypton charge-transfer collisions hydrogen is produced in the ground state and the krypton ions are preferentially populated in the ground ( $^{2}P_{\frac{3}{2}}$ ) state when the protons are incident at about 100 eV. The preferential population of ${\mathrm{Kr}}^{+}(^{2}P_{\frac{3}{2}})$ over ${\mathrm{Kr}}^{+}(^{2}P_{\frac{1}{2}})$ means that the hydrogen atoms will emerge spin polarized. We have calculated the spin-polarization fraction at 100 eV as a function of impact parameter and as a function of scattering angle, and the results are reported in this paper. A comparison of these results with the results of previous calculations of proton-xenon charge transfer indicates that the latter process is more suitable for producing spin-polarized hydrogen, at least for small scattering angles.In proton-krypton charge-transfer collisions hydrogen is produced in the ground state and the krypton ions are preferentially populated in the ground ($^{2}P_{\frac{3}{2}}$) state when the protons are incident at about 100 eV. The preferential population of ${\mathrm{Kr}}^{+}(^{2}P_{\frac{3}{2}})$ over ${\mathrm{Kr}}^{+}(^{2}P_{\frac{1}{2}})$ means that the hydrogen atoms will emerge spin polarized. We have calculated the spin-polarization fraction at 100 eV as a function of impact parameter and as a function of scattering angle, and the results are reported in this paper. A comparison of these results with the results of previous calculations of proton-xenon charge transfer indicates that the latter process is more suitable for producing spin-polarized hydrogen, at least for small scattering angles.

Physical Review AMay 1, 19738 citations

Formation of Atomic Tritium Clusters and Bose-Einstein Condensates

D. Blume, Brett D. Esry, Chris H. Greene +2 more

We present an extensive study of the static and dynamic properties of systems of spin-polarized tritium atoms. In particular, we calculate the two-body |F,m(F)>=|0,0> s-wave scattering length and show that it can be manipulated via a Feshbach resonance at a field strength of about 870 G. Such a resonance might be exploited to make and control a Bose-Einstein condensate of tritium in the |0,0> state. It is further shown that the quartet tritium trimer is the only bound hydrogen isotope and that its single vibrational bound state is a Borromean state. The ground state properties of larger spin-polarized tritium clusters are also presented and compared with those of helium clusters.We present an extensive study of the static and dynamic properties of systems of spin-polarized tritium atoms. In particular, we calculate the two-body |F,m(F)>=|0,0> s-wave scattering length and show that it can be manipulated via a Feshbach resonance at a field strength of about 870 G. Such a resonance might be exploited to make and control a Bose-Einstein condensate of tritium in the |0,0> state. It is further shown that the quartet tritium trimer is the only bound hydrogen isotope and that its single vibrational bound state is a Borromean state. The ground state properties of larger spin-polarized tritium clusters are also presented and compared with those of helium clusters.

arXiv:physics/0207002Physical Review LettersSep 30, 200255 citations

Identical spin rotation effect and electron spin waves in quantum gas of atomic hydrogen

L. Lehtonen, Otto Vainio, Janne Ahokas +7 more

We present an experimental study of electron spin waves in atomic hydrogen gas compressed to high densities of ∼5 × 10 18 cm −3 at temperatures ranging from 0.26 to 0.6 K in the strong magnetic field of 4.6 T. Hydrogen gas is in a quantum regime when the thermal de-Broglie wavelength is much larger than the s -wave scattering length. In this regime the identical particle effects play a major role in atomic collisions and lead to the identical spin rotation effect (ISR). We observed a variety of spin wave modes caused by this effect with strong dependence on the magnetic potential caused by variations of the polarizing magnetic field. We demonstrate confinement of the ISR modes in the magnetic potential and manipulate their properties by changing the spatial profile of the magnetic field. We have found that at a high enough density of H gas the magnons accumulate in their ground state in the magnetic trap and exhibit long coherence, which has a profound effect on the electron spin resonance spectra. Such macroscopic accumulation of the ground state occurs at a certain critical density of hydrogen gas, where the chemical potential of the magnons becomes equal to the energy of their ground state in the trapping potential.We present an experimental study of electron spin waves in atomic hydrogen gas compressed to high densities of ∼5 × 10 18 cm −3 at temperatures ranging from 0.26 to 0.6 K in the strong magnetic field of 4.6 T. Hydrogen gas is in a quantum regime when the thermal de-Broglie wavelength is much larger than the s -wave scattering length. In this regime the identical particle effects play a major role in atomic collisions and lead to the identical spin rotation effect (ISR). We observed a variety of spin wave modes caused by this effect with strong dependence on the magnetic potential caused by variations of the polarizing magnetic field. We demonstrate confinement of the ISR modes in the magnetic potential and manipulate their properties by changing the spatial profile of the magnetic field. We have found that at a high enough density of H gas the magnons accumulate in their ground state in the magnetic trap and exhibit long coherence, which has a profound effect on the electron spin resonance spectra. Such macroscopic accumulation of the ground state occurs at a certain critical density of hydrogen gas, where the chemical potential of the magnons becomes equal to the energy of their ground state in the trapping potential.

arXiv:1609.08432New Journal of PhysicsMay 4, 20182 citations

In proton-krypton charge-transfer collisions hydrogen is produced in the ground state and the krypton ions are preferentially populated in the ground (

^{2}P_{\frac{3}{2}}

) state when the protons are incident at about 100 eV. The preferential population of

{\mathrm{Kr}}^{+}(^{2}P_{\frac{3}{2}})

over

{\mathrm{Kr}}^{+}(^{2}P_{\frac{1}{2}})

means that the hydrogen atoms will emerge spin polarized. We have calculated the spin-polarization fraction at 100 eV as a function of impact parameter and as a function of scattering angle, and the results are reported in this paper. A comparison of these results with the results of previous calculations of proton-xenon charge transfer indicates that the latter process is more suitable for producing spin-polarized hydrogen, at least for small scattering angles.