Neutral–neutral reactions at the temperatures of interstellar clouds: Rate coefficients for reactions of atomic carbon, C(3P), with O2, C2H2, C2H4 and C3H6 down to 15 K
Literature Information
A CRESU (Cine′tique de Re′action en Ecoulement Supersonique Uniforme) apparatus has been used to measure rate coefficients for the reactions of ground-state carbon atoms, C(3P), with C2H2, C2H4, C3H6 and O2 at temperatures from 295 down to 15 K. C(3P) atoms were generated by photolysis of C3O2 at 193 nm using an ArF excimer laser and reaction rates were determined by observing the chemiluminescence from NO(B2Π) which is generated in the reaction between C(3P) atoms and NO2. The rate coefficients for all four reactions increase as the temperature is lowered, and those for reactions with the unsaturated hydrocarbons exceed 2×10-10 cm3 molecule-1 s-1 at all temperatures below 300 K. The results confirm that C(3P) atoms, like C2H radicals and CN radicals, react rapidly with unsaturated hydrocarbons at very low temperatures. It therefore seems likely that these reactions—and similar ones involving C(3P) atoms and other hydrocarbons—play an important role in forming species with long carbon chains in dense interstellar clouds.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.










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