Observation of quantum dynamical resonances in near cold inelastic collisions of astrophysical molecules

Costes, Michel; Naulin, Christian

doi:10.1039/c5sc04557f

Cited by 46 publications

(44 citation statements)

References 52 publications

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“…97 In crossed molecular beam experiments with laboratory frame velocities v 1 and v 2 and reduced mass µ for the colliding species, the collision energy in the center-of-mass frame (the relative translational energy) is given in terms of the relative velocity…”

Section: Experimental Studies Of Cold and Ultracold Reactions Andmentioning

confidence: 99%

“…The discrepancy was attributed in part to the restriction of a single adiabatic electronic potential energy surface (PES) for the scattering calculations. Several studies of inelastic collisions have been reported 97 [99][100][101] Ortho-H 2 (nuclear spin = 1) and para-H 2 (nuclear spin = 0) refer to two nuclear spin states of H 2 characterized by odd and even rotational levels, respectively. At these temperatures, several partial waves contribute leading to broad resonances in the energy dependence of the cross sections.…”

Section: Experimental Studies Of Cold and Ultracold Reactions Andmentioning

confidence: 99%

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Perspective: Ultracold molecules and the dawn of cold controlled chemistry

Balakrishnan

2016

The Journal of Chemical Physics

282

271

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Ultracold molecules offer unprecedented opportunities for the controlled interrogation of molecular events, including chemical reactivity in the ultimate quantum regime. The proliferation of methods to create, cool, and confine them has allowed the investigation of a diverse array of molecular systems and chemical reactions at temperatures where only a single partial wave contributes. Here we present a brief account of recent progress on the experimental and theoretical fronts on cold and ultracold molecules and the opportunities and challenges they provide for a fundamental understanding of bimolecular chemical reaction dynamics. Published by AIP Publishing. [http://dx

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Section: Experimental Studies Of Cold and Ultracold Reactions Andmentioning

confidence: 99%

Section: Experimental Studies Of Cold and Ultracold Reactions Andmentioning

confidence: 99%

Perspective: Ultracold molecules and the dawn of cold controlled chemistry

Balakrishnan

2016

The Journal of Chemical Physics

282

271

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“…[47][48][49][50] Another type of experiment that is not discussed herein concerns the opticalt rappingo fu ltracold molecules, such as KRb, to study ultracold collisions. [30,37,45,46,54,55] [30,37,45,46,54,55] …”

Section: Cold Collisionsmentioning

confidence: 99%

Unraveling Cold Molecular Collisions: Stark Decelerators in Crossed‐Beam Experiments

Vogels¹,

Meerakker²

2016

ChemPhysChem

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In the last two decades, enormous progress has been made in the manipulation of molecular beams. In particular, molecular decelerators have been developed with which advanced control over neutral molecules in a beam can be achieved. By using arrays of inhomogeneous and time-varying electric (or magnetic) fields, bunches of molecules can be produced with a tunable velocity, narrow velocity spreads, and almost perfect quantum-state purity. These monochromatic or "tamed" molecular beams are ideally suited to be used in crossed-molecular-beam scattering experiments. Here, we review the first generation of these "cold and controlled" scattering experiments that have been conducted in the last decade and discuss the prospects for this emerging field of research in the years to come.

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“…Experimental data are sparse but are critical for benchmarking theoretical methods [8][9][10] . Numerical solution of the Schrödinger equation offers the best hope for generating the bulk of the needed data.…”

Section: Introductionmentioning

confidence: 99%

Inelastic cross sections and rate coefficients for collisions between CO and H2

Castro

Doan

Klemka

et al. 2017

Molecular Astrophysics

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A five-dimensional coupled states (5D-CS) approximation is used to compute cross sections and rate coefficients for CO+H 2 collisions. The 5D-CS calculations are benchmarked against accurate six-dimensional close-coupling (6D-CC) calculations for transitions between low-lying rovibrational states. Good agreement between the two formulations is found for collision energies greater than 10 cm −1 . The 5D-CS approximation is then used to compute two separate databases which include highly excited states of CO that are beyond the practical limitations of the 6D-CC method.The first database assumes an internally frozen H 2 molecule and allows rovibrational transitions for v ≤ 5 and j ≤ 30, where v and j are the vibrational and rotational quantum numbers of the initial state of the CO molecule. The second database allows H 2 rotational transitions for initial CO states with v ≤ 5 and j ≤ 10. The two databases are in good agreement with each other for transitions that are common to both basis sets. Together they provide data for astrophysical models which were previously unavailable.

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Observation of quantum dynamical resonances in near cold inelastic collisions of astrophysical molecules

Abstract: Quantum resonances in inelastic collisions, predicted by theory and detected at low energies in a crossed-beam experiment, are reviewed.

Cited by 46 publications

References 52 publications

Perspective: Ultracold molecules and the dawn of cold controlled chemistry

Perspective: Ultracold molecules and the dawn of cold controlled chemistry

Unraveling Cold Molecular Collisions: Stark Decelerators in Crossed‐Beam Experiments

Inelastic cross sections and rate coefficients for collisions between CO and H2

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