Quantum dynamical resonances in low-energy co(j = 0) + he inelastic collisions

ABSTRACT In molecular collisions, long-lived complexes may be formed that correspond to quasi-bound states in the van der Waals potential and give rise to peaks in the collision

energy-dependent cross-sections. They are known as ‘resonances’ and their experimental detection remains difficult because their signatures are extremely challenging to resolve. Here, we

show a complete characterization of quantum-dynamical resonances occurring in CO–He inelastic collisions with rotational CO(_j_ = 0  1) excitation. Crossed-beam scattering experiments were

performed at collision energies as low as 4 cm−1, equivalent to a temperature of 4 K. Resonance structures in the measured cross-sections were identified by comparison with

quantum-mechanical calculations. The excellent agreement found confirms that the potential energy surfaces describing the CO–He van der Waals interaction are perfectly suitable for

calculating state-to-state (de)excitation rate coefficients at the very low temperatures needed in chemical modelling of the interstellar medium. We also computed these rate coefficients.

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support SIMILAR CONTENT BEING VIEWED BY OTHERS DETERMINING THE NATURE OF QUANTUM RESONANCES BY PROBING ELASTIC AND REACTIVE SCATTERING IN COLD COLLISIONS Article 30 November 2020 MAPPING

PARTIAL WAVE DYNAMICS IN SCATTERING RESONANCES BY ROTATIONAL DE-EXCITATION COLLISIONS Article 24 February 2022 ANISOTROPIC DYNAMICS OF RESONANT SCATTERING BETWEEN A PAIR OF COLD ALIGNED

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references ACKNOWLEDGEMENTS This work extends the objectives of the ANR-12-BS05-0011-02 contract with the Agence Nationale de la Recherche and contract no. 2007.1221 with the Conseil

Régional d'Aquitaine, for which financial support is acknowledged. The authors acknowledge support from Partenariat Hubert Curien van Gogh (contract 2013-28484TH). The authors thank L.

Song for help with scattering calculations on the full three-dimensional SAPT potential and N. Balakrishnan for checking the results of ref. 3. AUTHOR INFORMATION AUTHORS AND AFFILIATIONS *

Université de Bordeaux, Institut des Sciences Moléculaires, Talence Cedex 33405, France Astrid Bergeat, Christian Naulin & Michel Costes * CNRS, UMR 5255, Talence Cedex 33405, France

Astrid Bergeat, Christian Naulin & Michel Costes * Radboud University Nijmegen, Institute for Molecules and Materials, Heijendaalseweg 135, Nijmegen, 6525 AJ, The Netherlands Jolijn

Onvlee & Ad van der Avoird Authors * Astrid Bergeat View author publications You can also search for this author inPubMed Google Scholar * Jolijn Onvlee View author publications You can

also search for this author inPubMed Google Scholar * Christian Naulin View author publications You can also search for this author inPubMed Google Scholar * Ad van der Avoird View author

publications You can also search for this author inPubMed Google Scholar * Michel Costes View author publications You can also search for this author inPubMed Google Scholar CONTRIBUTIONS

A.B., C.N. and M.C. carried out the experimental measurements and data analysis. J.O. and A.v.d.A. performed the theoretical calculations. All authors discussed the results and contributed

to the manuscript. CORRESPONDING AUTHORS Correspondence to Ad van der Avoird or Michel Costes. ETHICS DECLARATIONS COMPETING INTERESTS The authors declare no competing financial interests.

SUPPLEMENTARY INFORMATION SUPPLEMENTARY INFORMATION Supplementary information (PDF 4322 kb) RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Bergeat, A.,

Onvlee, J., Naulin, C. _et al._ Quantum dynamical resonances in low-energy CO(_j_ = 0) + He inelastic collisions. _Nature Chem_ 7, 349–353 (2015). https://doi.org/10.1038/nchem.2204 Download

citation * Received: 22 October 2014 * Accepted: 12 February 2015 * Published: 24 March 2015 * Issue Date: April 2015 * DOI: https://doi.org/10.1038/nchem.2204 SHARE THIS ARTICLE Anyone you

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