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Table A.2

Infrared band positions and apparent band strength (A) values of water-ammonia mixed ices derived for the amorphous state at 8 K, and for a more ordered state at a higher temperature (n.d. stands for non detected).

Ice Frequency (cm-1) Frequencypure (cm-1)a Temperature (K) A (cm molec-1)b Apure (cm molec-1)c
H2O:NH3 (1:1)
NH3 418 419 8 3.2 × 10-18 8.1 (1.5) × 10-18
H2O 200 219 6.8 × 10-19 4.4 (1.7) × 10-18
NH3 380 419 150 -d 1.2 (0.2) × 10-17e
H2O 235 227 -d 5.3 (2.0) × 10-18
160
H2O:NH3 (3:1)
NH3 414 419 8 9.4 × 10-19 8.1 (1.5) × 10-18
H2O 200 219 1.8 × 10-18 4.4 (1.7) × 10-18
H2O:NH3 (1:3)
NH3 440 419 8 6.9 × 10-18 8.1 (1.5) × 10-18
H2O -d 219 n.d. 4.4 (1.7) × 10-18
NH3 480 419 120 n.d. 1.2 (0.2) × 10-17e
H2O n.d. 227 n.d. –
160

Notes.

(a)

Peak frequency of the related band in the pure ice, from Giuliano et al. (2014).

(b)

Derived from the analysis of the bands in the far-IR region.

(c)

Band strength of the pure ice, from Giuliano et al. (2014).

(d)

Band strengths at high temperatures were not calculated because the H2O:NH3 ratio changed after ammonia desorption (see text).

(e)

Band strength of the pure ammonia ice derived at 100 K.

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