Table 1
Experimental measurements of the ortho-para conversion timescale on different surfaces.
| Reference | Surface | Temperature |
|
|
| (K) | (s) | (s) | ||
|
|
||||
| (1) | Graphite | < 12 | 104 | 5 × 106 |
| (2) | Graphite | 10 | < 20 | – |
| (3) | Graphite | 10 | – | 1.2 × 103 |
| (4) | Water ice | 90 | 5 × 104 | – |
| (5) | Water ice | 12 | 3.6 × 103 | – |
| (6) | Water ice | 10 | – | > 2 × 104 |
| (7) | Water ice | 15 | 5 × 103−1 × 104 | – |
| (8) | Water ice (co-adsorbed O2) | 10 | 2.2 × 102 | – |
| Water ice (clean) | > 2 × 104 | – | ||
| (9) | Water ice (clean) | 10 | 2.3 × 102−7.1 × 102 | – |
Notes. See the text for details.
Reference. (1) Kubik et al. (1985); (2) Palmer & Willis (1987); (3) Yucel et al. (1990); (4) Sandler (1954); (5) Hixson et al. (1992); (6) Amiaud et al. (2008); (7) Watanabe et al. (2010); (8) Chehrouri et al. (2011); (9) Sugimoto & Fukutani (2011).
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