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Atoms
Special Issues
Cold and Ultracold Molecular Collisions
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Cold and Ultracold Molecular Collisions

A special issue of Atoms (ISSN 2218-2004). This special issue belongs to the section "Cold Atoms, Quantum Gases and Bose-Einstein Condensation".

Deadline for manuscript submissions: closed (15 June 2023) | Viewed by 1336

Special Issue Editors

Prof. Dr. Le Luo

E-Mail Website
Guest Editor
School of Physics and Astronomy, Sun Yat-Sen University, Zhuhai 519082, China
Interests: atomic, molecular and optical physics; quantum information; precision measurement physics
Dr. Yang Liu

E-Mail Website
Guest Editor
School of Physics and Astronomy, Sun Yat-Sen University, Zhuhai 519082, China
Interests: cold atoms and molecules
Prof. Dr. Yongchang Han

E-Mail Website
Guest Editor
Department of Physics, Dalian University of Technology, Dalian 116024, China
Interests: cold atoms and molecules

Special Issue Information

Dear Colleagues,

Molecular collisions play an important role in the understanding of many-body quantum physics. On one hand, the complexity of molecules, including the vibrational and rotational degrees of freedom, provide a rich platform where we are able to explore various processes of quantum collisions. On the other hand, molecule collisions are seen as the building blocks of more complex chemical processes in microscopic systems.

In recent years, the revolutionary technologies for creating cold and ultracold molecules have provided cutting-edge experiments for studying the fundamental phenomena of collision physics. Tremendous experimental advances in the field have already been achieved for exploring the nature of molecular collisions occurring at temperatures ranging from the kelvin to the nanokelvin regime. Understanding ultracold molecular collisions is crucial for further developing the techniques needed to control undesired collisional loss processes and make stable molecular gases. Moreover, insights into molecular collisions enable us to leverage their rich internal degrees of freedom for quantum engineering.

This Special Issue will include experimental observations, methods and theoretical contributions related to ultracold collisions involving nonreactive and reactive molecules. Original research articles, communications and reviews are welcome. The goal is to advance our current understanding of molecular interactions and bring the communities together by sharing various ideas.

Prof. Dr. Le Luo
Dr. Yang Liu
Prof. Dr. Yongchang Han
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Atoms is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1500 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ultracold molecules
  • collisional resonances
  • collisional complexes
  • quantum engineering
  • quantum chemistry

Published Papers (1 paper)

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Research

21 pages, 3628 KiB  
Article
Electronic Structure, Spectroscopy, Cold Ion–Atom Elastic Collision Properties, and Photoassociation Formation Prediction of the (MgCs)+ Molecular Ion
by Mohamed Farjallah, Dibyendu Sardar, Bimalendu Deb and Hamid Berriche
Atoms 2023, 11(9), 121; https://doi.org/10.3390/atoms11090121 - 15 Sep 2023
Cited by 1 | Viewed by 1032
Abstract
In this paper, we extensively study the electronic structure, interactions, and dynamics of the (MgCs)+ molecular ion. The exchanges between the alkaline atom and the low-energy cationic alkaline earths, which are important in the field of cold and ultracold quantum chemistry, are [...] Read more.
In this paper, we extensively study the electronic structure, interactions, and dynamics of the (MgCs)+ molecular ion. The exchanges between the alkaline atom and the low-energy cationic alkaline earths, which are important in the field of cold and ultracold quantum chemistry, are studied. We use an ab initio approach based on the formalism of non-empirical pseudo-potential for Mg2+ and Cs+ cores, large Gaussian basis sets, and full-valence configuration interaction. In this context, the (MgCs)+ cation is treated as an effective two-electron system. Adiabatic potential energy curves and their spectroscopic constants for the ground and the first 20 excited states of 1,3Σ+ symmetries are determined. Furthermore, we identify the avoided crossings between the electronic states of 1,3Σ+ symmetries. These crossings are related to the charge transfer process between the two ionic limits, Mg/Cs+ and Mg+/Cs. Therefore, vibrational-level spacings and the transition and permanent dipole moments are presented and analyzed. Using the produced potential energy data, the ground-state scattering wave functions and elastic cross-sections are calculated for a wide range of energies. In addition, we predict the formation of a translationally and rotationally cold molecular ion (MgCs)+ in the ground-state electronic potential energy through a stimulated Raman-type process aided by ion–atom cold collision. In the low-energy limit (<1 mK), elastic scattering cross-sections exhibit Wigner law threshold behavior, while in the high-energy limit, the cross-sections act as a function of energy E go as E−1/3. A qualitative discussion about the possibilities of forming cold (MgCs)+ molecular ions by photoassociative spectroscopy is presented. Full article
(This article belongs to the Special Issue Cold and Ultracold Molecular Collisions)
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