Determination of the branching ratio of CHOH + OH reaction on water ice surface at 10 K
arXiv:2309.10351 · doi:10.3847/1538-4357/acfb82
Abstract
The CHO and CHOH radicals can be important precursors of complex organic molecules (COMs) in interstellar dust. The COMs presumably originating from these radicals were abundantly found in various astronomical objects. Because each radical leads to different types of COMs, determining the abundance ratio of CHO to CHOH is crucial for a better understanding of the chemical evolution to various COMs. Recent work suggested that the reaction between CHOH and OH on ice dust plays an important role in forming CHO and CHOH radicals. However, quantitative details on the abundance of these radicals have not been presented to date. Herein, we experimentally determined the branching ratio (CHO/CHOH) resulting from the CHOH + OH reaction on the water ice surface at 10 K to be 4.3 0.6. Furthermore, the CHO product in the reaction would participate in subsequent diffusive reactions even at a temperature as low as 10 K. This fact should provide critical information for COMs formation models in cold molecular clouds.
arXiv commentAccepted in ApJ; 30 pages, 10 figures, 1 Table
References in corpus (29)
- Formation of methyl formate and other organic species in the warm-up phase of hot molecular cores
- Formation rates of complex organics in UV irradiated CH3OH-rich ices I: Experiments
- Formation of complex organic molecules in cold objects: the role of gas phase reactions
- Astrochemistry During the Formation of Stars
- The origin of complex organic molecules in prestellar cores
- The Spatial Distribution of Complex Organic Molecules in the L1544 Pre-stellar Core
- H-atom addition and abstraction reactions in mixed CO, H2CO and CH3OH ices: an extended view on complex organic molecule formation
- Constraining the abundances of complex organics in the inner regions of solar-type protostars
- A cold complex chemistry toward the low-mass protostar B1-b: evidence for complex molecule production in ices
- Experimental evidence for Glycolaldehyde and Ethylene Glycol formation by surface hydrogenation of CO molecules under dense molecular cloud conditions
- Multilayer modeling of porous grain surface chemistry I. The GRAINOBLE model
- The ALMA-PILS survey: Inventory of complex organic molecules towards IRAS 16293-2422 A
- Formation of Complex Organic Molecules in Cold Interstellar Environments through non-diffusive grain-surface and ice-mantle chemistry
- Binding energies of interstellar molecules on crystalline and amorphous models of water ice by ab-initio calculations
- The formation of ethylene glycol and other complex organic molecules in star-forming regions
- On Cosmic Ray-Driven Grain Chemistry in Cold Core Models
- H-D Substitution in Interstellar Solid Methanol: A Key Route for D Enrichment
- Detection of glycolaldehyde towards the solar-type protostar NGC1333 IRAS2A
- Production of complex organic molecules: H-atom addition versus UV irradiation
- Reactivity of OH and CH3OH between 22 and 64 K: Modelling the gas phase production of CH3O in Barnard 1b
- Chemical segregation of complex organic O-bearing species in Orion KL
- The GUAPOS project: G31.41+0.31 Unbiased ALMA sPectral Observational Survey -- I. Isomers of CHO
- Unified Microscopic-Macroscopic Monte Carlo Simulations of Complex Organic Molecule Chemistry in Cold Cores
- Diffusion activation energy and desorption activation energy for astrochemically relevant species on water ice show no clear relation
- Interstellar Glycolaldehyde, Methyl Formate, and Acetic Acid I: A Bi-modal Abundance Pattern in Star Forming Regions
- Tunneling Rate Constants for H2CO+H on Amorphous Solid Water Surfaces
- Transmission Electron Microscopy Study of the Morphology of Ices Composed of H2O, CO2, and CO on Refractory Grains
- Direct Determination of the Activation Energy for Diffusion of OH Radicals on Water Ice
- Methoxymethanol Formation Starting from CO-Hydrogenation