Table 1.
Summary of the Experimental Parameters for the Three Samples Prepared at the National Synchrotron Radiation Research Center
| Sample | Photon energy (eV) | Photon wavelength (nm) | H2O:Pyrimidine ratio | Irradiation time (h) | Photon flux (cm−2 s−1) |
|---|---|---|---|---|---|
| 0th order light | 4.1–49.6 | 25–300 | 7:1 | 20 | 3.08×1016 |
| He i line | 21.2 | 58.4 | 9:1 | 32 | 6.46×1013 |
| He ii line | 40.8 | 30.4 | 7:1 | 32 | 5.55×1013 |
Samples were simultaneously deposited and irradiated for either 20 h (0th order light experiment) or 32 h (He i and He ii line experiments) under similar temperature and pressure conditions (∼14 K, ∼1.0×10−9 torr).