Free Access
Table 2
Ammonia infrared band parameters and excitation rates.
| Vibrational band | Frequency | Aνa | gνa at 1 AU | Used |
| [cm-1] | [s-1] | [s-1] | ||
|
|
||||
| ν1 | 3337 | 7.7 | 3.3 × 10-5 | yes |
| ν2 | ≈ 950 | 16.2 | 27.7 × 10-5 | yes |
| 2ν2 | ≈ 1700 | 0.5 | 0.5 × 10-5 | no |
| 3ν2 | ≈ 2600 | 0.1 | 0.05 × 10-5 | no |
| ν1 + ν2 | 4315 | 1.6 | 0.5 × 10-5 | no |
| ν3 | 3450 | 3.8 | 1.5 × 10-5 | yes |
| ν4 | 1630 | 8.7 | 8.5 × 10-5 | yes |
| ν2 + ν4 | 2600 | 0.02 | 0.01 × 10-5 | no |
| ν3 + ν4 | 5000 | 15 | 3.7 × 10-5 | yes |
| ν1 + ν4 | 4960 | 0.6 | 0.2 × 10-5 | no |
| ν2 + ν3 | 4450 | 9 | 2.6 × 10-5 | yes |
| 2ν4 | 3240 | 2.7 | 0.4 × 10-5 | no |
Notes.
(a)
“Band” (as defined in Crovisier & Encrenaz 1983) Einstein coefficients and total excitation rates (from GEISA database Jacquinet-Husson et al. 2008) computed at 40 K.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.