Rydberg-State-Enabled Deceleration and Trapping of Cold Molecules

Hogan, S. D.; Seiler, Ch.; Merkt, Frédéric

doi:10.1103/physrevlett.103.123001

Cited by 94 publications

(105 citation statements)

References 35 publications

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“…Nevertheless, magnetically trapped hydrogen atoms in state H d have been produced at temperatures of 40 to 100 mK and densities up to 3 × 10 14 cm −3 by purely cryogenic methods [47,48] and then evaporatively cooled to produce a BEC of 10 9 atoms at a temperature of around 50 μK and densities between 10 14 and 5 × 10 15 cm −3 [49]. In addition, Zeeman deceleration and magnetic trapping of hydrogen have recently been demonstrated [50][51][52][53], although at higher temperatures and lower number densities. For sympathetic cooling purposes a BEC is unnecessary, but the high densities and large cloud sizes achievable with cryogenic methods are very valuable.…”

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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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 use of cold samples of molecular hydrogen may, in future, lead to a sufficient reduction of the Doppler width. At present, stationary samples of H 2 Rydberg molecules with a temperature of 100 mK can be produced, 44 corresponding to a Doppler width of 120 MHz at 400 nm. Further cooling to 7 mK or convenient phase-space manipulation would be required to reduce the Doppler width below 1 MHz, which is currently out of reach.…”

Section: The Ef / High-n Intervalmentioning

confidence: 99%

Towards measuring the ionisation and dissociation energies of molecular hydrogen with sub-MHz accuracy

et al. 2011

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The most precise determination of the ionisation and dissociation energies of molecular hydrogen H 2 was carried out recently by measuring three intervals independently: the X / EF interval, the EF / n ¼ 54p interval, and the electron binding energy of the n ¼ 54p Rydberg state. The values of the ionisation and dissociation energies obtained for H 2 , and for HD and D 2 in similar measurements, are in agreement with the results of the latest ab initio calculations [Piszczatowski et al., J. Chem. Theory Comput., 2009, 5, 3039; Pachucki and Komasa, Phys. Chem. Chem. Phys., 2010, 12, 9188] within the combined uncertainty limit of 30 MHz (0.001 cm À1 ). We report on a new determination of the electron binding energies of H 2 Rydberg states with principal quantum numbers in the range n ¼ 51-64 with a precision of better than 100 kHz using a combination of millimetre-wave spectroscopy and multichannel quantumdefect theory (MQDT). The positions of 33 np (S ¼ 0) Rydberg states of ortho-H 2 relative to the position of the reference 51d (Rydberg state have been determined with a precision and accuracy of 50 kHz. By analysing these positions using MQDT, the electron binding energy of the reference state could be determined to be 42.3009108(14) cm À1 , which represents an improvement by a factor of $7 over the previous value obtained by Osterwalder et al. [J. Chem. Phys., 2004, 121, 11810]. Because the electron binding energy of the high-n Rydberg states will ultimately be the limiting factor in our method of determining the ionisation and dissociation energies of molecular hydrogen, this result opens up the possibility of carrying out a new determination of these quantities. By evaluating several schemes for the new measurement, the precision limit is estimated to be 50-100 kHz, approaching the fundamental limit for theoretical values of $10 kHz imposed by the current uncertainty of the proton-to-electron mass ratio.

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“…Cold molecules are also beneficial for precision spectroscopy, serving as an important tool for exploring fundamental physics [13,14,15]. For various applications of cold polar molecules, achieving high purity of and control over their internal states [16,17,18], in addition to having the ability to manipulate their motional behaviour [19,20,21,22,23,24,25,26,27], is of paramount importance. In pursuit of this goal, cryogenic buffer-gas cooling has proven to be a very general and powerful method to produce internally and translationally cold molecules [28,29,30].…”

Section: Introductionmentioning

confidence: 99%

Thermometry of Guided Molecular Beams from a Cryogenic Buffer‐Gas Cell

Gantner

Zeppenfeld

et al. 2016

ChemPhysChem

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Abstract.We present a comprehensive characterization of cold molecular beams from a cryogenic buffer-gas cell, providing an insight into the physics of buffer-gas cooling. Cold molecular beams are extracted from a cryogenic cell by electrostatic guiding, which is also used to measure their velocity distribution. Molecules' rotational-state distribution is probed via radio-frequency resonant depletion spectroscopy. With the help of complete trajectory simulations, yielding the guiding efficiency for all of the thermally populated states, we are able to determine both the rotational and the translational temperature of the molecules at the output of the buffer-gas cell. This thermometry method is demonstrated for various regimes of buffer-gas cooling and beam formation as well as for molecular species of different sizes, CH 3 F and CF 3 CCH. Comparison between the rotational and translational temperatures provides evidence of faster rotational thermalization for the CH 3 F-He system in the limit of low He density. In addition, the relaxation rates for different rotational states appear to be different.2

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Rydberg-State-Enabled Deceleration and Trapping of Cold Molecules

Cited by 94 publications

References 35 publications

Sympathetic cooling of fluorine atoms with ultracold atomic hydrogen

Sympathetic cooling of fluorine atoms with ultracold atomic hydrogen

Towards measuring the ionisation and dissociation energies of molecular hydrogen with sub-MHz accuracy

Thermometry of Guided Molecular Beams from a Cryogenic Buffer‐Gas Cell

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