Table 3
Characteristic m/z peaks used for identification of photoproducts of the UV photolysis of the H2O:CH3CN (1:1 and 20:1)and H2 18 O:CH3CN (20:1) ices.
| H2O:CH3 CN m/z | H2 18 O:CH3 CN m/z | Elemental composition | Proposed molecular species | Name | ||
|---|---|---|---|---|---|---|
| CxHyNz | 2 | 2 | H2 | H2 | Mol. hydrogen | |
| 16 | 16 | CH4 | CH4 | Methane(*) | ||
| 26, 27 | 26, 27 | HCN | HCN/HNC | Hydrogen (iso)cyanide(*) | ||
| 42, 43 | 42, 43 | C2H5N | CH3CHNH | Imine (R-CHNH) | ||
| 44, 45 | 44, 45 | C2H7N | CH3CH2NH2 | Amine (R-CH2NH2) | ||
| 52 | 52 | C2N2 | CNNC/CNCN | Cyanogen/isocyanogen | ||
| 26, 52, 53 | 26, 52, 53 | C3H3N | CH2CHCN | 2-Propenenitrile | ||
| 28, 54 | 28, 54 | C3H5N | CH3CH2CN | Propionitrile | ||
| 29, 55 | 29, 55 | C3H5N | CH3CH2NC | Ethyl isocyanide | ||
| 56 | 56 | C2H4N2 | – | – | ||
| 66–69 | 66–69 | C3HxN2 | – | – | ||
| 77–83 | 77–83 | C4HyN2 | – | – | ||
| CxHyOz | 33, 34 | 37, 38 | H2O2 | H2O2 | Hydrogen peroxide | |
| 28 | 30 | CO | CO | Carbon monoxide | ||
| 29, 30 | 31, 32 | CH2O | H2CO | Formaldehyde(*) | ||
| 31, 32 | 33, 34 | CH4O | CH3OH | Methanol | ||
| 44 | 48 | CO2 | CO2 | Carbon dioxide | ||
| 44, 29 | 46, 31 | C2H4O | CH3CHO | Acetaldehyde(*) | ||
| 45, 46 | 47, 48 | C2H6O | CH3OCH3 | Dimethyl ether | ||
| 45, 31 | 47, 33 | C2H6O | CH3CH2OH | Ethanol | ||
| 29, 46, 45 | 31, 50, 49 | CHO2 | HCOOH | Formic acid | ||
| 31, 60 | 33, 64 | C2H4O2 | HCOOCH3/HOCH2CHO | Methyl formate/glycolaldehyde | ||
| 43, 45, 60 | 45, 49, 64 | C2H4O2 | CH3COOH | Acetic acid | ||
| 31, 62 | 33, 66 | C2H6O2 | (CH2OH)2 | Ethylene glycol | ||
| CxHyNzOw | 33 | 35 | NH3O | NH2OH | Hydroxylamine | |
| 43 | 45 | CNOH | HNCO/HOCN/HCNO | (iso)Cyanic acid/fulminic acid | ||
| 45 | 47 | CH3NO | NH2CHO | Formamide | ||
| 57 | 59 | C2H3NO | CH3NCO/HOCH2CN | Methyl isocyanate/glycolonitrile(*) | ||
| 58 | 60 | C2H4NO | – | – | ||
| 59 | 61 | C2H5NO | CH3CONH2/CH3NHCHO | Acetamide(*)/N-methyl formamide | ||
| 60 | 62 | CH4N2O | NH2CONH2 | Urea | ||
| 62 | 64 | C2H7NO | – | Amine | ||
| 63 | 67 | CH5NO2 | – | – | ||
| 64 | 68 | CH5NO2 | – | – | ||
| Other | 19, 37, 55, 73 | 21, 41, 61, 81 | H2n+1On | (H2O)nH+ | Water clusters H+ | |
| 60 | – | C2H6NO | (H2O)(CH3CN)H+ | Water/acetonitrile H+ | ||
Notes. Species previously detected using gas chromatography-mass spectrometry (GC-MS) after energetic processing of H2O:CH3CN ice are marked with an asterisk (*) based on Hudson et al. (2008).
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