Table 2
Upper limits to the column densities and molecular abundances of H2S2, HS
, and S2 estimated from the observations, and abundances calculated in laboratory experiments.
| N mol | Nmol/N(H2) | [Nmol/N(H2S)]obs | [Nmol/N(H2S)i]lab1 | |
| Molecule | (cm-2) | (%) | (%) | |
|
|
||||
| H2S2 | ≤6.1 × 1014 | ≤8.1 × 10-9 | ≤1.5 | ≤25.0 2 |
| HS |
≤8.0 × 1014 | ≤1.1 × 10-8 | ≤2.0 | 15.0 |
| S2 | ≤2.2 × 1016 | ≤2.9 × 10-7 | ≤55.0 | ...3 |
Notes.
After irradiation of pure H2S ices with a total fluence of ~1.5 × 1018 photons cm-2. Abundances are relative to the initial H2S in the experiments. Derived from Jiménez-Escobar et al. (2012).
This upper limit is estimated considering that all the sulfur atoms not contained in H2S or HS molecules at the end of the experiments reported in Jiménez-Escobar et al. (2012) are forming H2S2.
S2 was not quantified since it was detected by mass spectrometry during warm-up of the UV-processed ice analogs in Jiménez-Escobar et al. (2012), but not by infrared spectroscopy.
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