Related Experiment Video
Updated: Oct 4, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
Published on: May 9, 2014
The sensitivity of gas-phase models of dense interstellar clouds to changes in dissociative recombination branching
T J Millar1, D J DeFrees, A D McLean
1Mathematics Department, UMIST, Manchester, UK.
Abstract:
The approach of Bates to the determination of neutral product branching ratios in ion-electron dissociative recombination reactions has been utilised in conjunction with quantum chemical techniques to redetermine branching ratios for a wide variety of important reactions of this class in dense interstellar clouds. The branching ratios have then been used in a pseudo time-dependent model calculation of the gas phase chemistry of a dark cloud resembling TMC-1 and the results compared with an analogous model containing previously used branching ratios. In general, the changes in branching ratios lead to stronger effects on calculated molecular abundances at steady state than at earlier times and often lead to reductions in the calculated abundances of complex molecules. However, at the so-called "early time" when complex molecule synthesis is most efficient, the abundances of complex molecules are hardly affected by the newly used branching ratios.
More Related Videos
07:24Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer
Published on: February 19, 2018
12:11Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
Published on: April 8, 2020
Related Concept Videos
Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion
Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation
Inductive Effects on Chemical Shift: Overview
¹³C NMR: ¹H–¹³C Decoupling
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Mass Spectrometry: Branched Alkane Fragmentation
Chain Reactions