Measurements of collisional quenching of metastable hydrogen by helium in the thermal region ($v\ensuremath{\simeq}5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ a.u.) have been made. The resulting cross section ${\ensuremath{\sigma}}_{Q}\ensuremath{\simeq}8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}$ ${\mathrm{cm}}^{2}$ per atom is 20-25% larger than the theoretical results obtained by Byron and Gersten using a pseudopotential method.Measurements of collisional quenching of metastable hydrogen by helium in the thermal region ($v\ensuremath{\simeq}5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ a.u.) have been made. The resulting cross section ${\ensuremath{\sigma}}_{Q}\ensuremath{\simeq}8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}$ ${\mathrm{cm}}^{2}$ per atom is 20-25% larger than the theoretical results obtained by Byron and Gersten using a pseudopotential method.

Physical Review LettersAug 23, 197113 citations

Studies with ultracold metastable hydrogen

David Landhuis, W. Joffrain, Lia Matos +6 more

APSMay 1, 20010 citations

{\mathrm{cm}}^{2}

per atom is 20-25% larger than the theoretical results obtained by Byron and Gersten using a pseudopotential method.