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Quantum Chemical Approaches for Investigating Reaction Mechanisms in Organic Chemistry

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Physical Chemistry and Chemical Physics".

Deadline for manuscript submissions: 20 February 2026 | Viewed by 540

Special Issue Editor


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Guest Editor
School of Science and Technology, University of New England, Armidale, NSW 2351, Australia
Interests: quantum mechanics; density functional theory; coupled cluster theory; biochemistry; organic chemistry; reaction mechanisms; free-radical

Special Issue Information

Dear Colleagues,

As you are aware, since the advent of quantum chemical calculations, it is now possible to study reaction mechanisms using such methods. Previously, this was challenging using experimental techniques, no less given that transition states were not ‘observable’, and only on some occasions were intermediates detectable. This Special Issue is therefore dedicated to how QM methods may be applied to studying the mechanisms of organic reactions. This is an inherently broad topic, and we indeed welcome diverse submissions. In this regard, we welcome submissions that make use of modern DFT functions, as well as higher-level CCSD(T) (or higher-level) methods (i.e., W1-W4), or composite Gn methods (e.g., G3-G4) for the computation of barrier heights of specific processes, or complete reaction mechanisms for reactions related to organic chemistry. I look forward to your submissions in this field.

Dr. Robert O'Reilly
Guest Editor

Manuscript Submission Information

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Keywords

  • organic chemistry
  • biochemistry
  • density functional theory
  • coupled cluster theory
  • free radicals
  • reaction mechanisms
  • transition states

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Published Papers (1 paper)

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Research

18 pages, 2227 KB  
Article
Fine Structure Investigation and Laser Cooling Study of the CdBr Molecule
by Ali Mostafa, Israa Zeid, Nariman Abu El Kher, Nayla El-Kork and Mahmoud Korek
Int. J. Mol. Sci. 2026, 27(1), 184; https://doi.org/10.3390/ijms27010184 - 23 Dec 2025
Abstract
The ab initio calculations of the electronic structure of the low-lying electronic states of the CdBr molecule are characterized in the 2S+1Λ(+/−) and Ω(+/−) representations using the complete active-space self-consistent field (CASSCF) method, followed by the multireference configuration interaction (MRCI) [...] Read more.
The ab initio calculations of the electronic structure of the low-lying electronic states of the CdBr molecule are characterized in the 2S+1Λ(+/−) and Ω(+/−) representations using the complete active-space self-consistent field (CASSCF) method, followed by the multireference configuration interaction (MRCI) method with Davidson correction (+Q). The potential energy curves are investigated, and spectroscopic parameters (Te, Re, ωe, Be, αe, μe, and De) of the bound states are determined and analyzed. In addition, the rovibrational constants (Ev, Bv, Dv, Rmin, and Rmax) are reported for the investigated states with and without spin–orbit coupling. The electronic transition dipole moment curve (TDMC) is obtained for the C2Π1/2 − X2Σ+1/2 transition. Based on these data, Franck–Condon factors (FCFs), Einstein coefficient of spontaneous emission Aν’ν, radiative lifetime τ, vibrational branching ratios, and the associated slowing distance are evaluated. The results indicated that CdBr is a promising candidate for direct laser cooling, and a feasible cooling scheme employing four pumping and repumping lasers in the ultraviolet region with suitable experimentally accessible parameters is presented. These findings provide practical guidance for experimental spectroscopists exploring ultracold diatomic molecules and their applications. Full article
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