C.D.S. - SIMBAD4 rel 1.7 - 2020.05.29CEST19:01:26

2016A&A...593A..60B - Astronomy and Astrophysics, volume 593A, 60-60 (2016/9-1)

Radical-induced chemistry from VUV photolysis of interstellar ice analogues containing formaldehyde.


Abstract (from CDS):

Surface processes and radical chemistry within interstellar ices are increasingly suspected to play an important role in the formation of complex organic molecules (COMs) observed in several astrophysical regions and cometary environments. We present new laboratory experiments on the low-temperature solid state formation of complex organic molecules - glycolaldehyde, ethylene glycol, and polyoxymethylene - through radical-induced reactivity from VUV photolysis of formaldehyde in water-free and water-dominated ices. Radical reactivity and endogenous formation of COMs were monitored in situ via infrared spectroscopy in the solid state and post photolysis with temperature programmed desorption (TPD) using a quadripole mass spectrometer. We show the ability of free radicals to be stored when formed at low temperature in water-dominated ices, and to react with other radicals or on double bonds of unsaturated molecules when the temperature increases. It experimentally confirms the role of thermal diffusion in radical reactivity. We propose a new pathway for formaldehyde polymerisation induced by HCO radicals that might explain some observations made by the Ptolemy instrument on board the Rosetta lander Philae. In addition, our results seem to indicate that H-atom additions on H2CO proceed preferentially through CH2OH intermediate radicals rather than the CH3O radical.

Abstract Copyright: © ESO, 2016

Journal keyword(s): astrochemistry - molecular data - methods: laboratory: solid state - ISM: molecules

Status at CDS:  

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 384 3
2 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1025 1
3 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1894 1
4 NAME Large Molecule Heimat MoC 17 47 20.4943 -28 22 11.656           ~ 111 0
5 IRAS 18449-0115 cor 18 47 34.4947 -01 12 40.269           ~ 307 0

    Equat.    Gal    SGal    Ecl

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