Experimental and Theoretical Investigation of the Reaction of C₂H with Formaldehyde (CH₂O) at Very Low Temperatures and Application to Astrochemical Models.

ABSTRACT: Rate coefficients for the reaction of C₂H with CH₂O were measured for the first time over the temperature range of 37-603 K, with the C₂H radicals produced by pulsed laser photolysis and detected by CH radical chemiluminescence following their reaction with O₂. The low temperature measurements (≤93 K) relevant to the interstellar medium were made within a Laval nozzle gas expansion, while higher temperature measurements (≥308 K) were made within a temperature controlled reaction cell. The rate coefficients display a negative temperature dependence below 300 K, reaching (1.3 ± 0.2) × 10^-10 cm³ molecule^-1 s^-1 at 37 K, while only a slight positive temperature dependence is observed at higher temperatures a

SUBMITTER: Douglas KM 

PROVIDER: S-EPMC11664655 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature