Commentary Regarding the CRESU-SIS Experiment: Concerns About the Uniform Supersonic Flow Reactor

TL;DR

This commentary critiques the CRESU-SIS experiment's results, highlighting anomalies and diffusion effects that may undermine many published findings in low-temperature chemical kinetics using uniform supersonic flow reactors.

Contribution

It raises concerns about experimental anomalies and diffusion effects in the CRESU-SIS setup, questioning the validity of numerous prior results in the field.

Findings

Suspected decrease in flow density upon reactant injection

Diffusion effects likely influence reported kinetics data

Many published results may be affected by these anomalies

Abstract

This commentary addresses the anomalies in the results reported from the CRESU-SIS experiment at the Institute of Physics of Rennes, France. This experimental setup is dedicated to studying ion-molecule kinetic in the gas phase at very low temperatures using a uniform supersonic flow reactor. A reinterpretation of the latest study performed with this instrument highly suggests a dramatic decrease in flow density upon the injection of neutral reactants. In particular, these concerns can be related to the diffusion effects prevalent in the reported results on the vast majority of the kinetics experiments conducted with a uniform supersonic flow reactor. The scientific community in the field of low-temperature chemical kinetics in uniform supersonic flow would greatly benefit from being aware of and comprehending these highlighted anomalies because the evidence in this commentary calls into question many of the results published to date.