Ultracold chemistry and its reaction kinetics

Richter, Florian; Becker, Daniel G.; Bény, Cédric; Schulze, Torben; Ospelkaus, Silke; Osborne, Tobias J.

doi:10.1088/1367-2630/17/5/055005

Cited by 20 publications

(19 citation statements)

References 38 publications

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“…As anticipated theoretically, the measured decay rate constants vary considerably when confinement and collision energy are changed. This might be exploited to control the collisional properties of molecules.Recent advances in the preparation of ultracold molecular samples in well-defined quantum states 1-7 sparked increasing interest in studying molecular collisions and chemical reactions on a pure and fundamental level [8][9][10][11][12] . Such experiments were first carried out with highly excited molecules [13][14][15][16][17][18][19][20][21][22][23][24] (also in the context of Efimov physics 25-30 ), which can vibrationally relax in a collision.…”

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confidence: 99%

“…Recent advances in the preparation of ultracold molecular samples in well-defined quantum states [1][2][3][4][5][6][7] sparked increasing interest in studying molecular collisions and chemical reactions on a pure and fundamental level [8][9][10][11][12] . Such experiments were first carried out with highly excited molecules [13][14][15][16][17][18][19][20][21][22][23][24] (also in the context of Efimov physics [25][26][27][28][29][30] ), which can vibrationally relax in a collision.…”

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confidence: 99%

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Inelastic collisions of ultracold triplet Rb2 molecules in the rovibrational ground state

et al. 2017

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Exploring and controlling inelastic and reactive collisions on the quantum level is a main goal of the developing field of ultracold chemistry. For this, the preparation of precisely defined initial atomic and molecular states in tailored environments is necessary. Here we present experimental studies of inelastic collisions of metastable ultracold Rb2 molecules in an array of quasi-1D potential tubes. In particular, we investigate collisions of molecules in the absolute lowest triplet energy level where any inelastic process requires a change of the electronic state. Remarkably, we find similar decay rates as for collisions between rotationally or vibrationally excited triplet molecules where other decay paths are also available. The decay rates are close to the ones for universal reactions but vary considerably when confinement and collision energy are changed. This might be exploited to control the collisional properties of molecules.

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Inelastic collisions of ultracold triplet Rb2 molecules in the rovibrational ground state

et al. 2017

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“…Leading schemes rely on magnetically controlled Feshbach resonances [2,3,5,6,8,11,12] or on photoassociation via stimulated optical Raman transitions [1,7,9]. The possibility of hybrid Bose-Einstein condensates (BECs), described by atom-molecule models [13][14][15][16][17][18][19][20][21][22][23][24][25][26] thus opens the way to a new form of coherent 'superchemistry' [27][28][29][30] in which collective effects dominate reaction outcomes, as well as to molecular quantum computation [31,32].…”

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confidence: 99%

Interaction-induced instability and chaos in the photoassociative stimulated Raman adiabatic passage from atomic to molecular Bose-Einstein condensates

Dey,

Vardi

2020

Preprint

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We study the effect of interactions on the conversion of atomic -to molecular Bose-Einstein condensates via stimulated Raman adiabatic passage. Both energetic instability during avoided crossings and dynamical instability during chaotic intervals limit adiabaticity and impose low sweep-rate boundaries on the efficiency of the process. For the diabatic traverse of avoided crossings, we find a reciprocal power-law dependence of the final unconverted population on sweep rate. For the traverse of chaos, we find a sharp low-rate boundary determined by the dynamical instability parameters. The interplay of these two mechanisms determines which instability controls the failure of molecular production. A judicious choice of sweep parameters is hence required to restore the process efficiency.

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“…Fundamental questions in chemical physics can be addressed by cooling the reactants to low temperatures and preparing them in single quantum states [49][50][51]. In this regime, the wave nature of the reacting molecules, and the interference between these waves, is all important.…”

Section: Introductionmentioning

confidence: 99%

Laser cooling of molecules

Tarbutt

2018

Contemporary Physics

105

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Recently, laser cooling methods have been extended from atoms to molecules. The complex rotational and vibrational energy level structure of molecules makes laser cooling difficult, but these difficulties have been overcome and molecules have now been cooled to a few microkelvin and trapped for several seconds. This opens many possibilities for applications in quantum science and technology, controlled chemistry, and tests of fundamental physics. This article explains how molecules can be decelerated, cooled and trapped using laser light, reviews the progress made in recent years, and outlines some future applications.

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Ultracold chemistry and its reaction kinetics

Cited by 20 publications

References 38 publications

Inelastic collisions of ultracold triplet Rb2 molecules in the rovibrational ground state

Inelastic collisions of ultracold triplet Rb2 molecules in the rovibrational ground state

Interaction-induced instability and chaos in the photoassociative stimulated Raman adiabatic passage from atomic to molecular Bose-Einstein condensates

Laser cooling of molecules

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