We report on the buffer-gas cooling and trapping of CrH and MnH molecules in a magnetic quadrupole trap with densities on the order of ${10}^{6}\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}3}$ at a temperature of $650\phantom{\rule{0.3em}{0ex}}\mathrm{mK}$ . Storage times of up to $180\phantom{\rule{0.3em}{0ex}}\mathrm{ms}$ have been observed, corresponding to a 20-fold lifetime enhancement with respect to the field-free diffusion through the $^{3}\mathrm{He}$ buffer-gas. Using Monte Carlo trajectory simulations, inelastic molecule- $^{3}\mathrm{He}$ collision cross sections of $1.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}$ and $3.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}17}\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{2}$ are extracted for CrH and MnH, respectively. Furthermore, elastic molecule- $^{3}\mathrm{He}$ collision cross sections of $1.4(\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}14}\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{2}$ are determined for both species. We conclude that the confinement time of these molecules in a magnetic trapping field is limited by inelastic collisions with the helium atoms leading to Zeeman relaxation.We report on the buffer-gas cooling and trapping of CrH and MnH molecules in a magnetic quadrupole trap with densities on the order of ${10}^{6}\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}3}$ at a temperature of $650\phantom{\rule{0.3em}{0ex}}\mathrm{mK}$. Storage times of up to $180\phantom{\rule{0.3em}{0ex}}\mathrm{ms}$ have been observed, corresponding to a 20-fold lifetime enhancement with respect to the field-free diffusion through the $^{3}\mathrm{He}$ buffer-gas. Using Monte Carlo trajectory simulations, inelastic molecule-$^{3}\mathrm{He}$ collision cross sections of $1.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}$ and $3.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}17}\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{2}$ are extracted for CrH and MnH, respectively. Furthermore, elastic molecule-$^{3}\mathrm{He}$ collision cross sections of $1.4(\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}14}\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{2}$ are determined for both species. We conclude that the confinement time of these molecules in a magnetic trapping field is limited by inelastic collisions with the helium atoms leading to Zeeman relaxation.

Physical Review ASep 17, 200838 citations

Influence of inelastic collisions on the efficiency of optical pumping of alkali atoms in a gas cell

К. А. Баранцев, A.N. Litvinov

We study the processes of optical pumping of alkali metal atoms in the gas cell with buffer gas for the quantum magnetometers. The value of pumped magnetic moment is strongly influenced by the collision effects. Collisions of alkali atoms with the buffer gas lead to partial destruction of the atomic quantum state. As a first approximation, we can assume that the state of electronic shell collapses, but the state of the nucleus is saved. This work is devoted to the description of this effect and its impact to the polarization of the magnetic moment.We study the processes of optical pumping of alkali metal atoms in the gas cell with buffer gas for the quantum magnetometers. The value of pumped magnetic moment is strongly influenced by the collision effects. Collisions of alkali atoms with the buffer gas lead to partial destruction of the atomic quantum state. As a first approximation, we can assume that the state of electronic shell collapses, but the state of the nucleus is saved. This work is devoted to the description of this effect and its impact to the polarization of the magnetic moment.

International Conference Laser Optics (ICLO)Jun 20, 20220 citations

Calculation of diffusion lifetimes of excited atoms and molecules

Yu. Z. Ionikh

OptSpJul 1, 19811 citation

Energy transfer in collisions between excited atoms

A. Kopystyńska, L. Moi

Physics ReportsDec 1, 198259 citations

650\phantom{\rule{0.3em}{0ex}}\mathrm{mK}

. Storage times of up to

180\phantom{\rule{0.3em}{0ex}}\mathrm{ms}

have been observed, corresponding to a 20-fold lifetime enhancement with respect to the field-free diffusion through the

^{3}\mathrm{He}

buffer-gas. Using Monte Carlo trajectory simulations, inelastic molecule-

^{3}\mathrm{He}

collision cross sections of $1.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}$ and $3.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}17}\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{2}$ are extracted for CrH and MnH, respectively. Furthermore, elastic molecule-

^{3}\mathrm{He}

collision cross sections of $1.4(\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}14}\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{2}$ are determined for both species. We conclude that the confinement time of these molecules in a magnetic trapping field is limited by inelastic collisions with the helium atoms leading to Zeeman relaxation.