This article reviews recent progress in our understanding of gas-phase neutral reaction dynamics as made possible by improvements in the crossed molecular beam scattering technique for measuring reactive differential cross sections. A selection of crossed-beam studies on systems that play a fundamental role in our basic understanding of reaction phenomena are discussed to illustrate the capabilities of the experimental method. The examples include benchmark atom-diatom abstraction and insertion reactions, and four-atom radical reactions for which state-to-state, state-resolved, or state-averaged differential cross sections have recently been measured. The results are discussed in the light of the latest related theoretical developments regarding the treatment of potential energy surfaces and the dynamics of the systems. Recent results on crossed-beam studies of chemically relevant reactions of carbon, nitrogen, and oxygen atoms are also reviewed, and the latest developments in the technique are noted.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1146/annurev.physchem.50.1.347 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Gas-Phase Scattering of Transition Metal Atoms Fe, Ir, and Pt with CH, O, and CO.
J Phys Chem A
January 2025
Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Fudan University, Shanghai 200438, China.
Understanding the interactions between transition metal atoms and molecules is important for the study of various related chemical and physical processes. In this study, we have investigated collisions between iron (Fe), iridium (Ir), and platinum (Pt) and the small molecules CH, O, and CO using a crossed-beam and time-sliced ion velocity map imaging technique. Elastic collisions were observed in all cases, except for collisions of Pt with O and CO.
View Article and Find Full Text PDFExperimental and theoretical study of the Sn-O bond formation between atomic tin and molecular oxygen.
Phys Chem Chem Phys
November 2024
Department of Chemistry, University of Hawai'i at Manoa, Honolulu, HI 96822, USA.
The merging of the electronic structure calculations and crossed beam experiments expose the reaction dynamics in the tin (Sn, P) - molecular oxygen (O, XΣ-g) system yielding tin monoxide (SnO, XΣ) along with ground state atomic oxygen O(P). The reaction can be initiated on the triplet and singlet surfaces addition of tin to the oxygen atom leading to linear, bent, and/or triangular reaction intermediates. On both the triplet and singlet surfaces, formation of the tin dioxide structure is required prior to unimolecular decomposition to SnO(XΣ) and O(P).
View Article and Find Full Text PDFImaging Spin-Orbit Excitation of Yttrium through High-Energy Collisions with Rare Gas Atoms.
J Phys Chem Lett
August 2024
Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM), Fudan University, Shanghai 200438, China.
The energy required for spin-orbit excitation plays a critical role in understanding translational-to-electronic energy conversion, particularly in chemical reactions involving changes in spin states. This is particularly important for transition metal atoms possessing -orbitals, which result in multiple spin-orbit split energy levels at low energies. The accurate identification and characterization of spin-orbit transitions in such species require advanced experimental techniques and theoretical support.
View Article and Find Full Text PDFImaging the Collision Energy-Dependent Charge-Transfer Dynamics between the Spin-Orbit Ground Ar(P) Ion and CO.
J Phys Chem Lett
June 2024
Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
The collisional charge-transfer reaction between Ar(P) and CO represents one of the most studied ion-molecule systems; many controversies persist among different studies, and the detailed quantum state-to-state charge-transfer dynamics remains unknown. Here, differential cross sections of the charge-transfer process between the spin-orbit ground Ar(P) ion and CO are reported at three center-of-mass collision energies of 1.02, 0.
View Article and Find Full Text PDFIsomeric and rotational effects in the chemi-ionisation of 1,2-dibromoethene with metastable neon atoms.
Faraday Discuss
August 2024
Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056, Basel, Switzerland.
Article Synopsis
- The geometry of a molecule significantly affects its chemical reactivity, but studying different molecular isomers is challenging due to their tendency to interconvert.
- A new crossed-beam experiment was developed to separately analyze the stereoisomers and rotational states of 1,2-dibromoethene while examining their reactions with excited neon atoms.
- Findings highlighted distinct differences in reactivity based on the isomers and rotational states, emphasizing the crucial roles of molecular shape and motion in chemical reactions.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!