Methanol formation chemistry with revised reactions scheme

Abstract

The aim of the presented work is to analyze the impact of experimentally evaluated reactions of hydrogen abstraction on surfaces of interstellar grains on the chemical evolution of methanol and its precursors on grains and in the gas phase under conditions of cold dark cloud and during the collapse of the translucent cloud into the dark cloud. Analysis of simulation results shows that those reactions are highly efficient destruction channels for HCO and H2CO on grain surfaces, and significantly impact the abundances of almost all molecules participating in the formation of CH3OH. Next, in models with those reactions maximum abundances of methanol in gas and on grain surface decrease by more than 2-3 orders of magnitude in comparison to models without surface abstraction reactions of hydrogen. Finally, we study the impact of binding energies of CH2OH and CH3O radicals on methanol chemistry.

arXiv commentAccepted, to be published in Research in Astronomy and Astrophysics (RAA)

References in corpus (11)

• Formation rates of complex organics in UV irradiated CH3OH-rich ices I: Experiments
• 2018 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules
• Polycylcic Aromatic Hydrocarbons (PAH's) in dense cloud chemistry
• Reactive Desorption and Radiative Association as Possible Drivers of Complex Molecule Formation in the Cold Interstellar Medium
• Binding energies: new values and impact on the efficiency of chemical desorption
• The Spatial Distribution of Complex Organic Molecules in the L1544 Pre-stellar Core
• Formation of Complex Molecules in Prestellar Cores: a Multilayer Approach
• Hot corinos in NGC1333-IRAS4B and IRAS2A
• A Unified Monte Carlo Treatment of Gas-Grain Chemistry for Large Reaction Networks. II. A Multiphase Gas-Surface-Layered Bulk Model
• First ALMA maps of HCO, an important precursor of complex organic molecules, towards IRAS 16293-2422
• Organic species in Infrared Dark Clouds