Physical Review Letters

Suppression of Angular Forces in Collisions of Non- S -State Transition Metal Atoms

Roman V. Krems, Jacek A. Kłos, Michał F. Rode, Małgorzata M. Szczęśniak, Grzegorz Chałasiński, A. Dalgarno

Published Jan 3, 2005• 56 citations

Abstract

Angular momentum transfer is expected to occur rapidly in collisions of atoms in states of nonzero angular momenta due to the large torque of angular forces. We show that despite the presence of internal angular momenta transition metal atoms interact in collisions with helium effectively as spherical atoms and angular momentum transfer is slow. Thus, magnetic trapping and sympathetic cooling of transition metal atoms to ultracold temperatures should be readily achievable. Our results open up new avenues of research with a broad class of ultracold atoms.

DOI: 10.1103/physrevlett.94.013202

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Physical Review Letters

Suppression of Angular Forces in Collisions of Non- S -State Transition Metal Atoms

Roman V. Krems, Jacek A. Kłos, Michał F. Rode, Małgorzata M. Szczęśniak, Grzegorz Chałasiński, A. Dalgarno

Published Jan 3, 2005• 56 citations

Publisher

Abstract

DOI: 10.1103/physrevlett.94.013202

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Physica ScriptaOct 1, 200910 citations

We present a combined experimental and theoretical study of angular momentum depolarization in cold collisions of

^{2}P

atoms in the presence of an external magnetic field. We show that collision-induced Zeeman relaxation of

\text{Ga}({^{2}P}_{1/2})

and

\text{In}({^{2}P}_{1/2})

atoms in cold

^{4}\text{H}\text{e}

gas is dramatically suppressed compared to atoms in

{^{2}P}_{3/2}

states. Using rigorous quantum-scattering calculations based on ab initio interaction potentials, we demonstrate that Zeeman transitions in collisions of atoms in

{^{2}P}_{1/2}

electronic states occur via couplings to the

{^{2}P}_{3/2}

state induced by the anisotropy of the interaction potential. Our results suggest the feasibility of sympathetic cooling and magnetic trapping of

{^{2}P}_{1/2}

-state atoms, such as halogens, thereby opening up exciting areas of research in precision spectroscopy and cold-controlled chemistry.

{}^{2}{P}_{3/2}

f={m}_{f}=+2

), sympathetic cooling appears likely to succeed from starting temperatures around 1 K or even higher. This occurs because inelastic collisions are suppressed by

p

-wave and

d

-wave barriers that are 600 mK and 3.2 K high, respectively. In combination with recent results on

\mathrm{H}+\mathrm{NH}

and

\mathrm{H}+\mathrm{OH}

collisions [M. L. Gonz\'alez-Mart\'{\i}nez and J. M. Hutson, Phys. Rev. Lett. 111, 203004 (2013)], this establishes ultracold H atoms as a very promising and versatile coolant for atoms and molecules that cannot be laser-cooled.