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Table 2

Properties and sample purities of potential photoproducts of VUV-irradiated methanol ice.

Molecule Chemical formula Sample purity Tdes
Carbon monoxide CO 99.997% (Praxair) 28 K
Methane CH4 99.999% (Praxair) 30 K
Ethane C2H6 99% (Fluka) 60 K
Carbon dioxide CO2 99.996% (Praxair) 85 K
Formaldehyde H2CO 95% (Sigma Aldrich)1 95 K
Dimethyl ether CH3OCH3 99.9% (Fluka) 95 K
Acetaldehyde CH3CHO 99.5% (Sigma Aldrich) 105 K
Methyl formate HCOOCH3 99% (Sigma Aldrich) 120 K
Methanol CH3OH 99.8% (Sigma Aldrich) 130 K
Formic acid HCOOH 95% (Sigma Aldrich) 130 K
Ethanol CH3CH2OH 99.8% (Sigma Aldrich) 145 K
Water H2O milliQ-grade 155 K
Acetic acid CH3COOH 99.8% (Sigma Aldrich) 155 K
Glycolaldehyde HOCH2CHO Dimer (Sigma Aldrich)2 166 K
Ethylene glycol (CH2OH)2 99.8% (Sigma Aldrich) 198 K
Glycolic acid HOCH2COOH 99% (Sigma Aldrich)3 235 K
Glycerin HOCH2CHOHCH2OH 99.5% (Sigma Aldrich)3 235 K

Notes.

(1)

Gas phase monomer obtained by heating paraformaldehyde to 50 °C under vacuum.

(2)

Gas phase monomer obtained by heating glycolaldehyde dimer to 80 °C under vacuum (Hudson et al. 2005).

(3)

Glycolic acid and glycerin have a low vapour pressure at room temperature; owing to experimental constraints it was not possible to obtain their reference mass spectra.

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