Table 3
Infrared band positions and band strength (A) values of monocomponent ices in the range of interest from 500 cm-1 to 50 cm-1 at the deposition and phase transition temperatures.
| Ice | Temperature (K) | Frequency (cm-1)/(μm) | Mode | Modea | A (cm molec-1) | A (cm molec-1)b |
|
|
||||||
| NH3 | ||||||
| amorphous | 10 | 419 (22.2) | – | – | 8.1 (1.5) × 10-18 | 1.4 × 10-17 |
| crystalline | 100 | 535 (19.1) | – | wagging | ||
| 421 (27.5) | librationalc | torsion | 1.2 (0.2)× 10-17de | 2.0 × 10-17 | ||
| CH3OH | ||||||
| amorphous | 8 | 303 (33.0) | – | – | 9.3 (4.8) × 10-20 | 2.0 × 10-19 |
| crystalline | 120 | 347 (28.8) | translationalf | librational | 1.3 (6.6) × 10-18d | 5.1 × 10-19 |
| 177 (56.5) | librationalf | translational | 8.2 (4.3) × 10-19d | 3.9 × 10-19 | ||
| H2O | ||||||
| amorphous | 8 | 219 (45.7) | – | – | 4.4 (1.7) × 10-18 | 4.9 × 10-18 |
| crystalline | 150 | 227 (44.1) | transverse opticalg | librational | ||
| 160 (62.5) | longitudinal acousticg | translational | 5.3 (2.0) × 10-18de | 5.5 × 10-18 | ||
| CO2 | ||||||
| amorphous | 10 | 117 (85.5) | translationalh | translational | 1.3 (0.2)× 10-19 | – |
| 69 (144.9) | – | translational | 3.5 (0.6) × 10-20 | – | ||
Notes.
Derived from the optical constants available in the literature (see Sect. 4).
From Ferraro et al. (1980).
Estimated errors in the band strengths of the crystalline forms are derived from the corresponding percentual error calculated for the amorphous ice.
From Anderson et al. (1988).
From Bertie & Whalley (1967).
From Brown & King (1970).
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