arXiv:physics/0312105 · Physical Review A

Isotopic difference in the heteronuclear loss rate in a two-species surface trap

M. E. Holmes, M. Tscherneck, Pedro Antonio Quinto-Su, N. P. Bigelow

Published Jun 9, 2004• 18 citations

Abstract

We have realized a two-species mirror-magneto-optical trap containing a mixture of $^{87}\mathrm{Rb}\phantom{\rule{0.3em}{0ex}}(^{85}\mathrm{Rb})$ and $^{133}\mathrm{Cs}$ atoms. Using this trap, we have measured the heteronuclear collisional loss rate ${\ensuremath{\beta}}_{\mathrm{Rb-Cs}}^{\ensuremath{'}}$ due to intraspecies cold collisions. We find a distinct difference in the magnitude and intensity dependence of ${\ensuremath{\beta}}_{\text{Rb-Cs}}^{\ensuremath{'}}$ for the two isotopes $^{87}\mathrm{Rb}$ and $^{85}\mathrm{Rb}$ which we attribute to the different ground-state hyperfine splitting energies of the two isotopes.

DOI: 10.1103/physreva.69.063408

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arXiv:physics/0312105 · Physical Review A

Isotopic difference in the heteronuclear loss rate in a two-species surface trap

M. E. Holmes, M. Tscherneck, Pedro Antonio Quinto-Su, N. P. Bigelow

Published Jun 9, 2004• 18 citations

arXiv HTML PDF

Abstract

We have realized a two-species mirror-magneto-optical trap containing a mixture of

^{87}\mathrm{Rb}\phantom{\rule{0.3em}{0ex}}(^{85}\mathrm{Rb})

and

^{133}\mathrm{Cs}

atoms. Using this trap, we have measured the heteronuclear collisional loss rate

{\ensuremath{\beta}}_{\mathrm{Rb-Cs}}^{\ensuremath{'}}

due to intraspecies cold collisions. We find a distinct difference in the magnitude and intensity dependence of

{\ensuremath{\beta}}_{\text{Rb-Cs}}^{\ensuremath{'}}

for the two isotopes

^{87}\mathrm{Rb}

and

^{85}\mathrm{Rb}

which we attribute to the different ground-state hyperfine splitting energies of the two isotopes.

DOI: 10.1103/physreva.69.063408

Related papers

Isotopic difference in trap loss collisions of laser cooled rubidium atoms

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Physical Review ANov 1, 199912 citations

We have realized a two-species mirror-magneto-optical trap containing a mixture of

^{87}\mathrm{Rb}\phantom{\rule{0.3em}{0ex}}(^{85}\mathrm{Rb})

and

^{133}\mathrm{Cs}

atoms. Using this trap, we have measured the heteronuclear collisional loss rate

{\ensuremath{\beta}}_{\mathrm{Rb-Cs}}^{\ensuremath{'}}

due to intraspecies cold collisions. We find a distinct difference in the magnitude and intensity dependence of

{\ensuremath{\beta}}_{\text{Rb-Cs}}^{\ensuremath{'}}

for the two isotopes

^{87}\mathrm{Rb}

and

^{85}\mathrm{Rb}

which we attribute to the different ground-state hyperfine splitting energies of the two isotopes.

We report measurements of collisional rate constants for cold Rb atoms held in a magneto-optical trap.

^{85}\mathrm{Rb}

and

^{87}\mathrm{Rb}

display significantly different behavior. At low trap laser intensities, atoms which undergo a hyperfine-changing collision gain sufficient velocity to escape the trap. Since the hyperfine splittings are quite different for the isotopes, the loss rates display a large isotopic dependence in this regime. At higher trap laser intensities, where trap loss is due to inelastic collisions involving excited atoms, a dramatic and unexpected isotopic dependence is seen. Under identical conditions, the loss rate for

^{85}\mathrm{Rb}

is 3.3 times that of

^{87}\mathrm{Rb}

We report on measurements of trap-loss collisions between ultracold Rb atoms that are confined in a magneto-optical trap. Both isotopes,

{}^{85}\mathrm{Rb}

and

{}^{87}\mathrm{Rb},

have been studied over a wide range of trap laser intensities and detunings. The trap-loss collisional rate constant exhibits variations over three orders of magnitude. At low intensities and/or large detunings, the trap loss is dominated by ground-state hyperfine-changing collisions, while at high intensities and small detunings, collisions involving excited atoms are more important. We see significant differences between the isotopes in both regimes. At large detunings, the ability of the trap to recapture products of a hyperfine-changing collision is significantly diminished. This finding is supported by our numerical simulations of the recapture process. The trap loss rates due to collisions with room-temperature background gas have also been measured. A surprisingly large increase in this rate is seen when the confining power of the trap is reduced.

We have observed a heteronuclear trap loss rate for a mixture of trapped

{}^{39}\mathrm{K}

and

{}^{85}\mathrm{Rb}

atoms. Our results indicate that hyperfine changing collision and radiative escape dominate in the low and high intensity regimes, respectively. They are also consistent with radiative escape taking place with the participation of the doubly excited state potential $({\mathrm{K}}^{*}\ensuremath{-}{\mathrm{Rb}}^{*}).$ A Gallagher-Pritchard model taking into account the doubly excited channel was implemented, reproducing the experimental results well qualitatively. The values obtained for the cross species trap loss indicate possibilities of future experiments with this mixture.