Table 1: Infrared absorption bands and assignments of NH₃ and CO₂, in pure solids and in NH₃:CO₂ ice mixtures at 10 K.
Assignment Wavenumbers (cm^-1)

NH₃ Ferraro et al. (1980) Solid 1:1 ratio

$\nu_3$ 3375 3410; 3379

$2\nu_4$ 3290 3309

$\nu_1$ 3210 3219

$\nu_4$ 1625 1626

$\nu_2$ 1075 1064

$\nu_5$ 530

CO₂ Gerakines et al. (1995) Solid 1:1 ratio

$(\nu_1+\nu_3)$ 3708 3700

$(2\nu_2+\nu_3)$ 3600 3594

$(\nu_3)$ $\nu_{\rm as}$ CO₂ 2337 2333

$(\nu_3)$ $\nu_{\rm as}$ ¹³CO₂ 2282 2278

$(\nu_2)$ $\delta$ CO₂ 654 658

Vibration mode: stretching ( $\nu$ ), bending ( $\delta$ ).
Indication: asymmetric (as), symmetric (s).

**Table 1:** Infrared absorption bands and assignments of NH₃ and CO₂, in pure solids and in NH₃:CO₂ ice mixtures at 10 K.
Assignment	Wavenumbers (cm^-1)
NH₃ Ferraro et al. (1980)	Solid	1:1 ratio
$\nu_3$	3375	3410; 3379
$2\nu_4$	3290	3309
$\nu_1$	3210	3219
$\nu_4$	1625	1626
$\nu_2$	1075	1064
$\nu_5$	530
CO₂ Gerakines et al. (1995)	Solid	1:1 ratio
$(\nu_1+\nu_3)$	3708	3700
$(2\nu_2+\nu_3)$	3600	3594
$(\nu_3)$ $\nu_{\rm as}$ CO₂	2337	2333
$(\nu_3)$ $\nu_{\rm as}$ ¹³CO₂	2282	2278
$(\nu_2)$ $\delta$ CO₂	654	658

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