Optically induced conical intersections in traps for ultracold atoms and molecules

Wallis, Alisdair O. G.; Hutson, Jeremy M.

doi:10.1103/physreva.84.051402

Cited by 5 publications

(5 citation statements)

References 29 publications

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“…Another possibility for bridging the 1 mK -1 µK temperature gap is to immerse a gas of molecules into a buffer gas of already ultracold atoms. The calculations by Hutson and coworkers [649,657,658] demonstrated that alkalineearth metal atoms, being structureless and therefore weakly interacting, can be used for sympathetic cooling of molecules such as NH. Interestingly, Tscherbul and coworkers [672] have recently found that sympathetic cooling may work even with alkali metal atoms, such as Li, despite their propensity to generate strongly attractive and anisotropic interactions with molecules.…”

Section: A Towards Ultracold Moleculesmentioning

confidence: 99%

Manipulation of molecules with electromagnetic fields

et al. 2013

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I. INTRODUCTIONThe past few decades have witnessed remarkable developments of laser techniques setting the stage for new areas of research in molecular physics. It is now possible to interrogate molecules in the ultrafast and ultracold regimes of molecular dynamics and the measurements of molecular structure and dynamics can be made with unprecedented precision. Molecules are inherently complex quantum-mechanical systems. The complexity of molecular structure, if harnessed, can be exploited for yet another step forward in science, potentially leading to technology for quantum computing, quantum simulation, precise field sensors, and new lasers.The goal of the present article is to review the major developments that have led to the current understanding of molecule -field interactions and experimental methods for manipulating molecules with electromagnetic fields. Molecule -field interactions are at the core of several, seemingly distinct, areas of molecular physics. This is reflected in the organization of this article, which includes sections on Field control of molecular beams, External field traps for cold molecules, Control of molecular orientation and molecular alignment, Manipulation of molecules by nonconservative forces, Ultracold molecules and ultracold chemistry, Controlled many-body phenomena, Entanglement of molecules and dipole arrays, and Stability of molecular systems in high-frequency super-intense laser fields. By combining these topics in the same review, we would like to emphasize that all this work is based on the same basic Hamiltonian.This review is also intended to serve as an introduction to the excellent collection of articles appearing in this same-titled volume of Molecular Physics [1-27]. These original contributions demonstrate the latest developments exploiting control of molecules with electromagnetic fields. The reader will be treated to a colourful selection of articles on topics as diverse as Chemistry in laser fields, Quantum dynamics in helium droplets, Effects of microwave and laser fields on molecular motion, Rydberg molecules, Molecular structure in external fields, Quantum simulation with ultracold molecules, and Controlled molecular interactions, written by many of the leading protagonists of these fields.This article is concerned chiefly with the effects of electromagnetic fields on low-energy rotational, fine-structure and translational degrees of freedom. There are several important research areas that are left outside the scope of this paper, most notably the large body of work on the interaction of molecules with attosecond laser pulses and high harmonic generation [28], coherent control of molecular dynamics [29] and optimal control of molecular processes [30]. We limit the discussion of resonant interaction of light with molecules to laser cooling strategies. We do not survey spectroscopy or transfer of population between molecular states. Even with these restrictions, this is a vast area to review, as is apparent from the number of references. We did our best to in...

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Section: A Towards Ultracold Moleculesmentioning

confidence: 99%

Manipulation of molecules with electromagnetic fields

et al. 2013

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“…In addition, with the ready availability of laser-cooled atoms there is also a growing interest in these concepts applied to ultracold atom–atom collision. 16 − 18 The dramatic effect of the light-induced conical intersection on the photodissociation and photofragmentation of the D 2 + molecule was demonstrated in refs ( 19 − 21 ). Recently, Csehi et al 22 , 23 in theoretical studies showed that LICI in diatomics can be created even by quantized radiation field in an optical cavity.…”

Section: Introductionmentioning

confidence: 80%

“…Study of the core excited CO* molecule in X-ray regimes , show that LICIs should lead to nonadiabatic transitions between electronic, vibrational, and rotational degrees of freedom of the diatomic molecule. In addition, with the ready availability of laser-cooled atoms there is also a growing interest in these concepts applied to ultracold atom–atom collision. − The dramatic effect of the light-induced conical intersection on the photodissociation and photofragmentation of the D 2 + molecule was demonstrated in refs − . Recently, Csehi et al , in theoretical studies showed that LICI in diatomics can be created even by quantized radiation field in an optical cavity.…”

Section: Introductionmentioning

confidence: 99%

Quantum Control of Atom-Ion Charge Exchange via Light-Induced Conical Intersections

Петров

et al. 2023

J. Phys. Chem. A

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Conical intersections are crossing points or lines between two or more adiabatic electronic potential energy surfaces in the multidimensional coordinate space of colliding atoms and molecules. Conical intersections and corresponding nonadiabatic coupling can greatly affect molecular dynamics and chemical properties. In this paper, we predict significant or measurable nonadiabatic effects in an ultracold atom–ion charge-exchange reaction in the presence of laser-induced conical intersections (LICIs). We investigate the fundamental physics of these LICIs on molecular reactivity under unique conditions: those of relatively low laser intensity of 108 W/cm2 and ultracold temperatures below 1 mK. We predict irregular interference effects in the charge-exchange rate coefficients between K and Ca+ as functions of the laser frequency. These irregularities occur in our system due to the presence of two LICIs. To further elucidate the role of the LICIs on the reaction dynamics, we compare these rate coefficients with those computed for a system where the CIs have been “removed”. In the laser frequency window, where conical interactions are present, the difference in rate coefficients can be as large as 1 × 10–9 cm3/s.

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“…1 In order to understand the prospect of cooling trapped molecules to ultralow temperatures, many authors have recently studied the effects of external fields on molecular collisions and chemical reactions. [70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88] Pioneering experimental studies explored the dynamics of inelastic spin relaxation of magnetically trapped molecular radicals CaH 5,6 and NH 36,37 colliding with background He atoms in a cryogenic environment, and more recent experiments observed cold N-NH, 4 OH-OH, 70 OH-ND 3 , 3 and Rb-ND 3 60 collisions in co-trapped atom-molecule and molecule-molecule ensembles. 4 An exothermic chemical reaction has been observed to occur in an ultracold gas of KRb molecules at temperatures below 1 µK.…”

Section: Introductionmentioning

confidence: 99%

Molecular collisions and reactive scattering in external fields: Are field-induced couplings important at short range?

Vieira

Krems

Tscherbul

2017

The Journal of Chemical Physics

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We use accurate quantum scattering calculations to elucidate the role of short-range molecule-field interactions in atom-molecule inelastic collisions and abstraction chemical reactions at low temperatures. We consider two examples: elastic and inelastic scattering of NH(Σ3) molecules with Mg(S1) atoms in a magnetic field; reactive scattering LiF + H → Li + HF in an electric field. Our calculations suggest that, for non-reactive collision systems and abstraction chemical reactions, the molecule-field interactions cannot generally be neglected at short range because the atom-molecule potential passes through zero at short range. An important exception occurs for Zeeman transitions in atom-molecule collisions at magnetic fields ≲1000 G, for which the molecule-field couplings need only be included at large ρ outside the range of the atom-molecule interaction. Our results highlight the importance of an accurate description of ρ-dependent molecule-field interactions in quantum scattering calculations on molecular collisions and chemical reactions at low temperatures.

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Optically induced conical intersections in traps for ultracold atoms and molecules

Cited by 5 publications

References 29 publications

Manipulation of molecules with electromagnetic fields

Manipulation of molecules with electromagnetic fields

Quantum Control of Atom-Ion Charge Exchange via Light-Induced Conical Intersections

Molecular collisions and reactive scattering in external fields: Are field-induced couplings important at short range?

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