Quenching of $para$-H${}_2$ with an ultra-cold anti-hydrogen atom ${\bar{H}}_{1s}$

Abstract

In this work we report the results concerning calculations for quantum-mechanical rotational transitions in molecular hydrogen, H${}_2$, induced by an ultra-cold ground state anti-hydrogen atom ${\bar{H}}_{1s}$. The calculations are accomplished using a non-reactive close-coupling quantum-mechanical approach. The H${}_2$ molecule is treated as a rigid rotor. The total elastic scattering cross section ${\sigma }_{el}(\epsilon )$ at energy $\epsilon$, state-resolved rotational transition cross sections ${\sigma }_{j{j}^{\prime }}(\epsilon )$ between states $j$ and $j^{\prime }$ and corresponding thermal rate coefficients $k_{j{j}^{\prime }}(T)$ are computed in the temperature range 0.004 K $\lesssim T\lesssim$ 4 K. Satisfactory agreement with other calculations (variational) has been obtained for ${\sigma }_{el}(\epsilon )$.

24 pages, 3 tables, 8 figures

References in corpus (7)

• Theory of ultracold Fermi gases
• Interaction of Ultracold Antihydrogen with a Conducting Wall
• State resolved rotational excitation cross sections and rates in H2+H2 collisions
• Rotational Energy Transfer in H2+H2
• One- and two-photon resonant spectroscopy of hydrogen and anti-hydrogen atoms in external electric fields
• Close-coupling calculations of rotational energy transfer in p-H2+HD
• State-resolved rotational cross sections and thermal rate coefficients for ortho-/para-H2+HD at low temperatures and HD+HD elastic scattering

Cited by in corpus (2)

• Antihydrogen $(\bar{\mathrm{H}})$ and muonic antihydrogen $({\bar{\mathrm{H}}}_{\mu })$ formation in low energy three-charge-particle collisions
• Ultracold collisions between two light indistinguishable diatomic molecules: elastic and rotational energy transfer in HD+HD