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Table 3
Experimental diffusion rates D (cm2 s-1) for CO, HNCO, H2CO, and NH3 in ASW as a function of temperature, derived from either Fick’s second law of diffusion or from an Avrami equation.
| Diffusion rates D (cm2 s-1) | ||||
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| Temp. (K) | Thick. (nm) | Thick. (ML) | Fick law | Avrami eq. |
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| CO | ||||
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| 35 | 171 | 489 | 5.2 × 10-13 | 8.5 × 10-13 |
| 36.8 | 754 | 2156 | 6.5 × 10-13 | 7.0 × 10-13 |
| 40 | 347 | 992 | 8.0 × 10-13 | 8.0 × 10-13 |
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| H2CO | ||||
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| 110 | 271 | 775 | 2.0 × 10-14 | 2.7 × 10-13 |
| 115 | 30 | 86 | 3.0 × 10-14 | 2.4 × 10-15 |
| 120 | 29 | 83 | 7.0 × 10-14 | 1.6 × 10-14 |
| 125 | 163 | 466 | 8.0 × 10-14 | 1.1 × 10-12 |
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| NH3 | ||||
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| 115 | 260 | 743 | 4.5 × 10-13 | 7.5 × 10-13 |
| 117 | 380 | 1086 | 4.5 × 10-12 | 8.5 × 10-12 |
| 120 | 580 | 1658 | 1.1 × 10-11 | 1.9 × 10-11 |
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| HNCO | ||||
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| 130 | 150 | 429 | 1.1 × 10-15 | 1.8 × 10-13 |
| 135 | 390 | 1115 | 2.7 × 10-13 | 2.7 × 10-13 |
| 140 | 230 | 657 | 5.0 × 10-13 | 6.0 × 10-13 |
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