Structure ‘Dirty’ Ices

reaction products

core

H2O

CO

CO2

CH3OH

Cosmic

Rays

UV light

Heating

effects

NH3

CH4

H2CO

H2

H

CO

H2O

reaction products

reaction

products

Grain provides a ‘catalytic’ surface with a weak H-bonded network

Surface diffusion brings adsorbed molecular species into close contact

aerosols

PAH

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