Molecular vibration in cold-collision theory

Volpi, Alessandro; Bohn, John L.

doi:10.1103/physreva.65.064702

Cited by 59 publications

(111 citation statements)

References 27 publications

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“…For paramagnetic molecules, by contrast, weak-and strong-field seeking states can be nearly degenerate at low magnetic field values (e.g., 17 O 2 as discussed in Refs. [29,30]. In the present case, OH is also paramagnetic and hence could in principle be magnetically trapped.…”

Section: A Prospects For Evaporative Coolingmentioning

confidence: 92%

Collisional dynamics of ultracold OH molecules in an electrostatic field

2002

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Ultracold collisions of polar OH molecules are considered in the presence of an electrostatic field. The field exerts a strong influence on both elastic and state-changing inelastic collision rate constants, leading to clear experimental signatures that should help disentangle the theory of cold molecule collisions.Based on the collision rates we discuss the prospects for evaporative cooling of electrostatically trapped OH. We also find that the scattering properties at ultralow temperatures prove to be remarkably independent of the details of the short-range interaction, owing to avoided crossings in the long-range adiabatic potential curves. The behavior of the scattering rate constants is qualitatively understood in terms of a novel set of long-range states of the [OH] 2 dimer.

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Section: A Prospects For Evaporative Coolingmentioning

confidence: 92%

Collisional dynamics of ultracold OH molecules in an electrostatic field

2002

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“…For sympathetic cooling purposes a BEC is unnecessary, but the high densities and large cloud sizes achievable with cryogenic methods are very valuable. Cross section have outgoing L 2 [54,55]. The s-wave inelastic collisions are therefore suppressed by an L = 2 centrifugal barrier in the outgoing channel, which, for H + F, collisions is 3.2 K high.…”

Section: A Atomic Hyperfine and Zeeman Levelsmentioning

confidence: 99%

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 17 O 2 molecule is considered to be a rigid rotor, with internuclear distance frozen to the equilibrium value of r 0 = 2.282 bohr (the rigid rotor model has been shown to be very accurate for this system at the investigated collision energies [14]). The fine-structure HamiltonianĤ f s and the HamiltonianĤ B for the interaction of the molecule with the external magnetic field follow the treatment in Ref.…”

Section: Theorymentioning

confidence: 99%

Magnetic-field effects in ultracold molecular collisions

Volpi

Bohn

2002

Phys. Rev. A

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We investigate the collisional stability of magnetically trapped ultracold molecules, taking into account the influence of magnetic fields. We compute elastic and spin-state-changing inelastic rate constants for collisions of the prototype molecule 17 O 2 with a 3 He buffer gas as a function of the magnetic field and the translational collision energy. We find that spin-state-changing collisions are suppressed by Wigner's threshold laws as long as the asymptotic Zeeman splitting between incident and final states does not exceed the height of the centrifugal barrier in the exit channel. In addition, we propose a useful one-parameter fitting formula that describes the threshold behavior of the inelastic rates as a function of the field and collision energy. Results show a semi-quantitative agreement of this formula with the full quantum calculations, and suggest useful applications also to different systems. As an example, we predict the low-energy rate constants relevant to evaporative cooling of molecular oxygen.

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Molecular vibration in cold-collision theory

Cited by 59 publications

References 27 publications

Collisional dynamics of ultracold OH molecules in an electrostatic field

Collisional dynamics of ultracold OH molecules in an electrostatic field

Sympathetic cooling of fluorine atoms with ultracold atomic hydrogen

Magnetic-field effects in ultracold molecular collisions

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