Chemical pathways in ultracold reactions of SrF molecules

Meyer, Edmund; Bohn, John L.

doi:10.1103/physreva.83.032714

Cited by 21 publications

(39 citation statements)

References 42 publications

(52 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(14)] of both components |M L | = 0,1 at ultracold temperature are the same in the van der Waals regime and are dictated by a d 6 dependence in the electric regime [Eqs. (16) and (18)] with different magnitudes. These expressions provide a clear explanation of the trends observed numerically.…”

Section: Qt Model For P-wave Collisionsmentioning

confidence: 99%

Universalities in ultracold reactions of alkali-metal polar molecules

et al. 2011

Self Cite

View full text Add to dashboard Cite

We consider ultracold collisions of ground-state heteronuclear alkali-metal dimers that are susceptible to four-center chemical reactions 2AB → A 2 + B 2 even at submicrokelvin temperatures. These reactions depend strongly on species, temperature, electric field, and confinement in an optical lattice. We calculate ab initio van der Waals coefficients for these interactions and use a quantum formalism to study the scattering properties of such molecules under an external electric field and optical lattice. We also apply a quantum threshold model to explore the dependence of reaction rates on the various parameters. We find that, among the heteronuclear alkali-metal fermionic species, LiNa is the least reactive, whereas LiCs is the most reactive. For the bosonic species, LiK is the most reactive in zero field, but all species considered, LiNa, LiK, LiRb, LiCs, and KRb, share a universal reaction rate once a sufficiently high electric field is applied. For indistinguishable bosons, the inelastic/reactive rate increases as d 2 in the quantum regime, where d is the dipole moment induced by the electric field. This is a weaker power-law dependence than for indistinguishable fermions, for which the rate behaves as d 6 .

show abstract

Section: Qt Model For P-wave Collisionsmentioning

confidence: 99%

Universalities in ultracold reactions of alkali-metal polar molecules

et al. 2011

Self Cite

View full text Add to dashboard Cite

show abstract

“…To proceed to ultracold temperatures would require evaporative cooling, whereby the highestenergy molecules are siphoned off and the remainder come to thermal equilibrium via elastic collisions. But this procedure comes with a catch: if the molecules are reactive, e.g., by the reaction 2 SrF → SrF 2 + Sr [11], then they may be lost to this reaction before coming into thermal equilibrium.…”

Section: Introductionmentioning

confidence: 99%

ShieldingΣ2ultracold dipolar molecular collisions with electric fields

Quéméner

Bohn

2016

Phys. Rev. A

Self Cite

View full text Add to dashboard Cite

The prospects for shielding ultracold, paramagnetic, dipolar molecules from inelastic and chemical collisions are investigated. Molecules placed in their first rotationally excited states are found to exhibit effective long-range repulsion for applied electric fields above a certain critical value, as previously shown for non-paramagnetic molecules. This repulsion can safely allow the molecules to scatter while reducing the risk of inelastic or chemically reactive collisions. Several molecular species of 2 Σ molecules of experimental interest -RbSr, SrF, BaF, and YO -are considered, and all are shown to exhibit orders of magnitude suppression in quenching rates in a sufficiently strong laboratory electric field. It is further shown that, for these molecules described by Hund's coupling case b, electronic and nuclear spins play the role of spectator with respect to the shielding.

show abstract

“…At shorter ranges, the quantum statistics and chemical nature of the specific species comes to the forefront [4,14]. Polar radicals behave in even richer fashions: topological crystals [15], half-integer vortices generated by conical intersections [16], and spin-dependent chemistry [17] have been predicted, and the utility of using magnetic fields to trap radicals while performing electricdipole-dependent studies has already been demonstrated [14,18,19]. Motivated by these predictions, several groups are pursuing the production of ultracold radicals such as RbSr [19,20] and LiYb [21].…”

mentioning

confidence: 99%

Microwave state transfer and adiabatic dynamics of magnetically trapped polar molecules

Stuhl¹,

Yeo²,

Sawyer³

et al. 2012

Phys. Rev. A

View full text Add to dashboard Cite

Cold and ultracold polar molecules with nonzero electronic angular momentum are of great interest for studies in quantum chemistry and control, investigations of novel quantum systems, and precision measurement. However, in mixed electric and magnetic fields, these molecules are generically subject to a large set of avoided crossings among their Zeeman sublevels; in magnetic traps, these crossings lead to distorted potentials and trap loss from electric bias fields. We have characterized these crossings in OH by microwave-transferring trapped OH molecules from the upper f ; M = + 3 2 parity state to the lower e; + 3 2 state and observing their trap dynamics under an applied electric bias field. Our observations are very well described by a simple Landau-Zener model, yielding insight to the rich spectra and dynamics of polar radicals in mixed external fields.PACS numbers: 37.10. Pq,33.80.Be, Cold polar molecule experiments have made a remarkable transformation over the past decade, progressing all the way from the first demonstrations of basic motional control of molecules [1][2][3] to studies in ultracold chemistry [4], polar collisions [5][6][7], and precision measurement [8,9]. Closed-shell molecules at low temperatures and long ranges present nearly featureless electric dipoles [10,11], yielding universal scattering behavior and the prediction of generic dipolar condensates [12] or crystals [13]. At shorter ranges, the quantum statistics and chemical nature of the specific species comes to the forefront [4,14]. Polar radicals behave in even richer fashions: topological crystals [15], half-integer vortices generated by conical intersections [16], and spin-dependent chemistry [17] have been predicted, and the utility of using magnetic fields to trap radicals while performing electricdipole-dependent studies has already been demonstrated [14,18,19]. Motivated by these predictions, several groups are pursuing the production of ultracold radicals such as RbSr [19,20] and LiYb [21].While the combination of electric and magnetic dipoles enables fascinating new phenomena, it also comes with substantial complications. In particular, simple linear Zeeman spectra are converted to tangles of interwoven avoided crossings by the application of remarkably small transverse electric fields. In this Letter, we report the experimental observation of these crossings in the polar radical OH and their dramatic impact on dynamics in a magnetic trap. In its 2 Π 3/2 ground electronic state, stationary OH has a magnetic dipole moment of 2µ B (where µ B is the Bohr magneton) and an electric moment of 1.67 D (0.65 a. u.); rotational averaging reduces each of these in the laboratory frame to µwhere J is the total angular momentum, M is its labfixed projection, andΩ is the magnitude of J's projection on the internuclear axis. Each rotational level of OH contains two Zeeman manifolds of opposite parity, |e; M and |f ; M ; with no applied fields, these states are split by a Λ-doublet coupling of 1.667 GHz. In an applied electric field, |e a...

show abstract

Chemical pathways in ultracold reactions of SrF molecules

Cited by 21 publications

References 42 publications

Universalities in ultracold reactions of alkali-metal polar molecules

Universalities in ultracold reactions of alkali-metal polar molecules

ShieldingΣ2ultracold dipolar molecular collisions with electric fields

Microwave state transfer and adiabatic dynamics of magnetically trapped polar molecules

Contact Info

Product

Resources

About