Table 3: Infrared absorption bands of the species formed upon VUV irradiation of a NH3:CO2 ice at 10 K.
Wavenumbers Species Assigment Band Strength
(cm-1)     (cm molecule-1)
2164 (w) OCN- a ($\nu_3$) $\nu_{\rm as}$ (NCO) $1.30\times10^{-16}$
2140 (vs) CO b ($\nu_1$) $\nu$ C=O $1.10\times10^{-17}$
1694 (vw) NH2COOH dimer c $\nu$ C=O $5\times10^{-18}$
1590 (m) [HCOO-][NH4+] d, e $\nu_{\rm as}$(COO-) $1.0\times10^{-16}$
1548 (m) [NH2COO-][NH4+] c $\nu_{\rm as}$(COO-) $2\times10^{-17}$
1501 (s) [HCOO-][NH4+] d, e $\delta_{\rm s}$ (NH4+)  
1389 (w) [HCOO-][NH4+] d, e $\delta_{\rm s}$ (CH) $8.0\times10^{-18}$
1330 (w) [HCOO-][NH4+] d, e $\nu_{\rm s}$(COO-) $1.7\times10^{-17}$
1319 (w) NH2COOH dimer c    
1240 (vw) ? ?  
References. a Raunier (2003); b Gerakines (1995); c this work;
d Hudson (2000); e Schutte (1999).
Vibration mode: stretching ($\nu$), bending ($\delta$).
Indication: asymmetric (as), symmetric (s).
Intensities: very strong (vs), strong (s), medium (m), weak (w) and very weak (vw).


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