Roundabout Mechanism of Ion–Molecule Nucleophilic Substitution Reactions

X Wu, F Ying, H Wang, L Yang, J Zhang… - ACS Physical Chemistry …, 2024 - ACS Publications
Roundabout (RA) is an important indirect mechanism for gas-phase X–+ CH3Y→ XCH3+ Y–
SN2 reactions at a high collision energy. It refers to the rotation of the CH3-group by half or …

Nonstatistical reaction dynamics

B Jayee, WL Hase - Annual Review of Physical Chemistry, 2020 - annualreviews.org
Nonstatistical dynamics is important for many chemical reactions. The Rice-Ramsperger-
Kassel-Marcus (RRKM) theory of unimolecular kinetics assumes a reactant molecule …

[HTML][HTML] Energy and temperature dependent dissociation of the Na+ (benzene) 1, 2 clusters: Importance of anharmonicity

S Kolakkandy, AK Paul, S Pratihar… - The Journal of …, 2015 - pubs.aip.org
Chemical dynamics simulations were performed to study the unimolecular dissociation of
randomly excited Na+(Bz) and Na+(Bz) 2 clusters; Bz= benzene. The simulations were …

Role of non-statistical effects in deciding the fate of HO 3˙ in the atmosphere

PK Rai, P Kumar - Physical Chemistry Chemical Physics, 2024 - pubs.rsc.org
HO3˙ has been postulated as a reservoir for OH˙ in various atmospheric reactions. Under
collision-free conditions, experiments indicate that the lifetime of this species should be …

Full-dimensional accurate potential energy surface and dynamics for the unimolecular isomerization reaction CH3NC⇌ CH3CN

J Li, J Li, J Li - The Journal of Chemical Physics, 2025 - pubs.aip.org
The reaction CH 3 NC⇌ CH 3 CN, a model reaction for the study of unimolecular
isomerization, is important in astronomy and atmospheric chemistry and has long been …

Dynamics of Na+(Benzene) + Benzene Association and Ensuing Na+(Benzene)2* Dissociation

AK Paul, S Kolakkandy, WL Hase - The Journal of Physical …, 2015 - ACS Publications
Chemical dynamics simulations were used to study Bz+ Na+ (Bz)→ Na+ (Bz) 2* association
and the ensuing dissociation of the Na+ (Bz) 2* cluster (Bz= benzene). An interesting and …

[HTML][HTML] Direct dynamics simulations of the unimolecular dissociation of dioxetane: probing the non-RRKM dynamics

S Malpathak, X Ma, WL Hase - The Journal of Chemical Physics, 2018 - pubs.aip.org
In a previous UB3LYP/6-31G* direct dynamics simulation, non-Rice–Ramsperger–Kassel–
Marcus (RRKM) unimolecular dynamics was found for vibrationally excited 1, 2-dioxetane …

Breaking of a bond: when is it statistical?

PK Yadav, S Keshavamurthy - Faraday Discussions, 2015 - pubs.rsc.org
Unimolecular dissociation dynamics of a model three degree of freedom triatomic molecule
is studied in order to understand the mechanisms for deviations from statisticality …

Unimolecular rate constants versus energy and pressure as a convolution of unimolecular lifetime and collisional deactivation probabilities. Analyses of intrinsic non …

S Malpathak, WL Hase - The Journal of Physical Chemistry A, 2019 - ACS Publications
Following work by Slater and Bunker, the unimolecular rate constant versus collision
frequency, k uni (ω, E), is expressed as a convolution of unimolecular lifetime and collisional …

Unimolecular Dissociation of γ-Ketohydroperoxide via Direct Chemical Dynamics Simulations

EG Naz, M Paranjothy - The Journal of Physical Chemistry A, 2020 - ACS Publications
γ-Ketohydroperoxide [3-(hydroperoxy) propanal] is an important reagent in synthetic
chemistry and, in particular, oxidation reactions. It is considered to be a precursor for …