Towards magnetic slowing of atoms and molecules

Narevicius, Edvardas; Parthey, Christian G.; Libson, A.; Riedel, Max F.; Even, U.; Raizen, Mark G.

doi:10.1088/1367-2630/9/4/096

Cited by 41 publications

(35 citation statements)

References 13 publications

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“…The resulting matrix elements are given in the Appendix. The parameters for the 19 F hyperfine Hamiltonian were taken from Ref. [31].…”

Section: Basis Sets and Matrix Elementsmentioning

confidence: 99%

“…In our case, κ ≈ 10.5. Figure 6(a) shows the ratio γ of elastic to inelastic cross sections, as a function of the collision energy and magnetic field, for 19 F initially in state F h . The diagonal black line shows the field at which the Zeeman energy is 6k B T , so that 99.9% of the F atoms at temperature T sample fields below the line.…”

Section: Sympathetic Coolingmentioning

confidence: 99%

“…However, Doherty et al [17] have recently used the PhotoStop approach [18] to trap Br atoms below 1 K at number densities up to 10 8 cm −3 . In addition, halogen atoms may be amenable to Zeeman deceleration [19]. However, such techniques by themselves are unlikely to reach the true ultracold regime below 1 mK and a second-stage cooling method is needed.…”

Section: Introductionmentioning

confidence: 99%

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Sympathetic cooling of fluorine atoms with ultracold atomic hydrogen

González-Martínez

Hutson²

2013

Phys. Rev. A

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We consider the prospect of using ultracold hydrogen atoms for sympathetic cooling of fluorine atoms to microkelvin temperatures. We carry out quantum-mechanical calculations on collisions between cold F and H atoms in magnetically trappable states and show that the ratio of elastic to inelastic cross sections remains high across a wide range of temperatures and magnetic fields. For F atoms initially in the spin-stretched state ( 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 H + NH and H + OH collisions [M. L. González-Martínez 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.

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“…The resulting matrix elements are given in the Appendix. The parameters for the 19 F hyperfine Hamiltonian were taken from Ref. [31].…”

Section: Basis Sets and Matrix Elementsmentioning

confidence: 99%

Section: Sympathetic Coolingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sympathetic cooling of fluorine atoms with ultracold atomic hydrogen

González-Martínez

Hutson²

2013

Phys. Rev. A

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“…Similar effects were previously discussed in Refs. [12,61,63,70,71,72,73,74,75]. With the effective-mass formalism, these effects can now be explained within a unified approach.…”

Section: Longitudinal Massmentioning

confidence: 99%

Positive and negative effective mass of classical particles in oscillatory and static fields

Dodin

Fisch

2008

Phys. Rev. E

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A classical particle oscillating in an arbitrary high-frequency or static field effectively exhibits a modified rest mass m eff derived from the particle averaged Lagrangian. Relativistic ponderomotive and diamagnetic forces, as well as magnetic drifts, are obtained from the m eff dependence on the guiding center location and velocity. The effective mass is not necessarily positive and can result in backward acceleration when an additional perturbation force is applied. As an example, adiabatic dynamics with m|| > 0 and m|| < 0 is demonstrated for a wave-driven particle along a dc magnetic field, m|| being the effective longitudinal mass derived from m eff . Multiple energy states are realized in this case, yielding up to three branches of m|| for a given magnetic moment and parallel velocity.

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“…24 Most atoms in the periodic table have a magnetic moment in their ground state or in a long-lived metastable state allowing the control of the atomic motion using magnetic fields. The principle of magnetic deceleration is conceptually simple: low-field seekers lose kinetic energy by moving into the high magnetic field region at the centre of an electromagnetic coil.…”

Section: Neutral Atom Experimentsmentioning

confidence: 99%

An experimental test of the weak equivalence principle for antihydrogen at the future FLAIR facility

Blaum

Raizen

Quint

2014

Int. J. Mod. Phys. Conf. Ser.

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We present new experimental ideas to investigate the gravitational interaction of antihydrogen. The experiment can first be performed in an off-line mirror measurement on hydrogen atoms, as a testing ground for our methods, before the implementation with antihydrogen atoms. A beam of hydrogen atoms is formed by launching a cold beam of protons through a cloud of trapped electrons in a nested Penning trap arrangement. In the next step, the atoms are stopped in a series of pulsed electromagnetic coilsso-called atomic coilgun. The stopped atoms are confined in a magnetic quadrupole trap and cooled by single-photon laser cooling. We intend to employ the method of Raman interferometry to study the gravitational interaction of atomic hydrogen -and later on antihydrogen at the FLAIR facility -with high sensitivity.

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Towards magnetic slowing of atoms and molecules

Abstract: We outline a method to slow paramagnetic atoms or molecules using pulsed magnetic fields. We also discuss the possibility of producing trapped particles by adiabatic deceleration of a magnetic trap. We present numerical simulation results for the slowing and trapping of molecular oxygen.

Cited by 41 publications

References 13 publications

Sympathetic cooling of fluorine atoms with ultracold atomic hydrogen

Sympathetic cooling of fluorine atoms with ultracold atomic hydrogen

Positive and negative effective mass of classical particles in oscillatory and static fields

An experimental test of the weak equivalence principle for antihydrogen at the future FLAIR facility

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