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Table A.1

Infrared band positions and apparent band strength (A) values of water-methanol 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 A (cm molec-1)b Apure (cm molec-1)c
H2O:CH3OH (1:1)
CH3OH n.d. 303 8 n.d. 9.3 (4.8) × 10-20
H2O 203 219 ≤5.5 × 10-18d 4.4 (1.7) × 10-18
CH3OH 344 347 130 8.1 × 10-19 1.3 (6.6) × 10-18e
170f 177 n.d. 8.2 (4.3) × 10-19e
H2O 215 227 4.6 × 10-18g 5.3 (2.0) × 10-18h
160
H2O:CH3OH (3:1)
CH3OH n.d. 303 8 n.d. 9.3 (4.8) × 10-20
H2O –i 219 ≤5.1 × 10-18d 4.4 (1.7) × 10-18
CH3OH 345 347 130 1.4 × 10-18 1.3 (6.6) × 10-18e
176f 177 8.2 (4.3) × 10-19e
H2O 219 227 5.5 × 10-18g 5.3 (2.0) × 10-18h
160
H2O:CH3OH (10:1)
CH3OH n.d. 303 8 n.d. 9.3 (4.8) × 10-20
H2O 205 219 ≤8.3 × 10-18d 4.4 (1.7) × 10-18
CH3OH n.d. 347 135 n.d. 1.3 (6.6) × 10-18e
n.d. 177 n.d. 8.2 (4.3) × 10-19e
H2O 223 227 ≤5.5 × 10-18j 5.3 (2.0) × 10-18h
160

Notes.

(a)

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

(b)

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

(c)

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

(d)

The band corresponding to amorphous water is blended with the wide undetected band of methanol at ~303 cm-1.

(e)

Band strength of the pure methanol ice derived at 120 K.

(f)

With contribution of the peak observed at ~160 cm-1 in the red side of the crystalline water far-IR band (see text).

(g)

Assuming that the band strength of the ~177 cm-1 vibrational mode is modified by the same factor than the ~347 cm-1 mode with respect to the pure ice case, and substracting the hypothetical area of the ~177 cm-1 band to the total area of the ~227 cm-1 band.

(h)

Band strength of the pure water ice derived at 150 K.

(i)

The band was detected, but the peak frequency could not be derived because of the noise in that region of the spectrum (see Fig. 4).

(j)

The band corresponding to crystalline water is blended with the undetected band of methanol at ~177 cm-1.

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