Issue 35, 2023

The role of small molecular cations in the chemical flow of the interstellar environments

Abstract

Molecular ions have been ubiquitous in a variety of environments in the interstellar medium, from Circumstellar Envelopes to Dark Molecular Clouds and to Diffuse Clouds. Their role in the multitude of molecular processes which have been found to occur in those environments has been the subject of many studies over the years, so that we have acquired by now a complex body of data on their chemical structures, their possible function within chemical reactions and their most likely paths to formation. In the present work we review a broad range of such molecular ions, focusing exclusively on positive ions involving the smallest and simplest cations which have been either detected or conjectured as present in the interstellar medium (ISM). We therefore consider mainly molecular cations formed with components like H, H+, He and He+, atomic species which are by far the most abundant baryons in the ISM in general. Their likely structures and their roles in a variety of chemical energy flow paths are discussed and presented within the context of their interstellar environments.

Graphical abstract: The role of small molecular cations in the chemical flow of the interstellar environments

Article information

Article type
Perspective
Submitted
26 jun 2023
Accepted
15 aug 2023
First published
17 aug 2023
This article is Open Access
Creative Commons BY-NC license

Phys. Chem. Chem. Phys., 2023,25, 23370-23383

The role of small molecular cations in the chemical flow of the interstellar environments

L. González-Sánchez, N. Sathyamurthy and F. A. Gianturco, Phys. Chem. Chem. Phys., 2023, 25, 23370 DOI: 10.1039/D3CP03000H

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