A new instrument for kinetics and branching ratio studies of gas phase collisional processes at very low temperatures

Creators: Durif, O.; Capron, M.; Messinger, J. P.; Benidar, A.; Biennier, L.; Bourgalais, J.; Canosa, A.; Courbe, J.; Garcia, G. A.; Gil, J. F.; Nahon, L.; Okumura, M.; Rutkowski, L.; Sims, I. R.; Thiévin, J.; Le Picard, S. D.

Abstract

A new instrument dedicated to the kinetic study of low-temperature gas phase neutral–neutral reactions, including clustering processes, is presented. It combines a supersonic flow reactor with vacuum ultra-violet synchrotron photoionization time-of-flight mass spectrometry. A photoion–photoelectron coincidence detection scheme has been adopted to optimize the particle counting efficiency. The characteristics of the instrument are detailed along with its capabilities illustrated through a few results obtained at low temperatures (<100 K) including a photoionization spectrum of n-butane, the detection of formic acid dimer formation, and the observation of diacetylene molecules formed by the reaction between the C₂H radical and C₂H₂.

Additional Information

© 2020 Published under license by AIP Publishing. Submitted: 17 September 2020; Accepted: 16 December 2020; Published Online: 19 January 2021. The authors would like to thank Jacques Sorieux, Didier Biet, Fabienne Blanchet, Ewen Gallou, Guy Pécheul, Yvonig Robert, and Alexandre Dapp from the Université de Rennes 1 mechanical workshop for their technical support, as well as Gregory H. Jones from Caltech for assistance in performing some of the experiments. The authors also thank Bertrand Rowe and Sébastien Morales for valuable scientific discussions ahead of the project implementation. The authors are grateful to an anonymous reviewer for helpful comments that greatly improved the quality of this manuscript. This work was supported by the French National Research Agency through the project CRESUSOL (Grant No. ANR-11-BS04-0024) and the CNRS-INSU "Programme National de Physique et Chimie du Milieu Interstellaire (PCMI)" and "Programme National de Planétologie (PNP)." SDLP acknowledges financial support from the Institut Universitaire de France. This work was also supported, in part, by the National Science Foundation under Grant No. CHE-1413712. J.P.M. was supported by the National Science Foundation Graduate Research Fellowship (NSF GRFP) and the National Science Foundation Graduate Research Opportunities Worldwide (NSF GROW) programs. J.P.M. would also like to thank the Office for Science and Technology of the Embassy of France in the United States for a Chateaubriand Fellowship. The authors thank the QUADMARTS International Research Network for promoting their collaboration. We warmly thank the whole SOLEIL staff for providing beamtime under Project Nos. 20160297 and 20181883. Data Availability: The data that support the findings of this study are available from the corresponding author upon reasonable request.

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