Table 1. Products species detected in the O3 + C2H4 reaction.
Bold parenthetical numbers refer to species in Figs. 4 and 5. Rotational transitions of each product were monitored at the frequencies listed in the third column, which are obtained from the references in the fourth column. The absolute abundances in each pulse are estimated using a calibrated OCS sample and have a margin of error of about an order of magnitude owing to uncertainties in the rotational temperature and instrument response function.
| Molecule | Rotational transition | Frequency (MHz) | Reference | Absolute abundance (molecules/pulse) | Relative abundance | |
| 1,2,3-Trioxolane (POZ) | 11,1–00,0 | 12,591.52 | (29) | Not observed | — | |
| O3 ⋯C2 H4 | (1) | 21,1–10,1 | 15,800.7834 | (30) | 3 × 1012 | 500 |
| CH2OO | (2) | 10,1–00,0 | 23,186.4873 | (16, 17) | 6 × 109 | 1 |
| Formaldehyde* | (3) | 21,2–21,1 | 14,488.4803 | (31) | 2 × 1016 | 3.3 × 106 |
| Dioxirane | (4) | 21,1–20,2 | 31,752.8794 | (32) | 3 × 1011 | 50 |
| Formic acid | (6) | 10,1–00,0 | 22,471.1795 | (33) | 2 × 1013 | 3333 |
| Ethylene ozonide | (8) | 11,1–00,0 | 12,828.6233 | (34) | 5 × 1011 | 83 |
| Ethylene oxide | (11) | 11,0–10,1 | 11,385.9111 | (35) | 8 × 1011 | 133 |
| Acetaldehyde | (12) | 11,1–20,2 | 8,243.4683 | (36) | 7 × 1012 | 1166 |
| Formic anhydride | (13) | 21,2–11,1 | 11,734.1252 | (37) | 2 × 1012 | 333 |
*The only accessible transition of formaldehyde in the 5 to 42 GHz range of our spectrometer is a low-frequency K -type doublet, which makes the molecular abundance calculation less certain.