Table 4.
Molecular Production Yields (Number of Molecules of Pyrimidine Deposited Needed to Produce One Molecule of a Given Product) and Relative Proportions (Ratios) Estimated for 4(3H)-Pyrimidone and Uracil in the Residues Produced from the UV/EUV Irradiation of H2O:Pyrimidine Ices with the 0th Order Beam Light, the He i Line, and the He ii Line
| Sample | 4(3H)-Pyrimidone | Uracil | Ratio |
|---|---|---|---|
| 0th order light | 1/450 | 1/1900 | 4.4 |
| He i line | 1/1.4×104 | 1/3.6×106 | 254 |
| He ii line | 1/3400 | 1/1.2×105 | 36.5 |
| H2 lamp | 1/670 | 1/9300 | 13.9 |
Values are compared with what was obtained for a residue produced from an H2O:pyrimidine=20:1 ice mixture photo-irradiated with an H2-discharge lamp (Nuevo et al., 2009).