Table 4:

Assignment of infrared absorption features produced by the radiolysis of the H₂O:NH₃:CO ice (1:0.6:0.4) by 46 MeV Ni ions at 13 K and after warming to 300 K.

Frequency	Wavelength	Temp.	Molecule	Notes
(cm-1)	(m)	(K)
2233	4.48	13	N2O	[1,2]
2218-2200	4.51-4.54	300	nitriles	[8]
2168	4.61	13, 300	OCN-	[1,3,4,7]
2147	4.66	300	aliph. isocyanide	[8]
2112	4.73	300	NCO	[2]
1725	5.80	300	ester	[5]
1683	5.94	300	amides	[5]
1652	6.05	300	asym-N2O	[2]
1637	6.11	13	?
1593	6.28	300	NH3+CH2COO	[6]
1558	6.42	300	?
1533	6.52	300	?
1506	6.64	300	NH3+CH2COO	[6]
1490	6.71	13	NH4+	[1,3,7]
1474	6.78	13	NO	[2]
1440	6.94	13	NH3+CH2COO	[6]
1415	7.07	300	NH3+CH2COO	[6]
1370	7.30	13, 300	HMT	[5]
			HCOO-	[5,9]
1338	7.47	13, 300	NH3+CH2COO	[6]
			NH2CH2COO	[6]
			HCOO-	[9]
1305	7.66	13	N2O; N2O	[2]
1283	7.80	300	N2O	[2]

Tentative assignment. [1] Proton bombardment of several ices (Hudson et al. 2001); [2] Electron bombardment of N₂:CO₂ (Jamieson et al. 2005); [3] Hudson & Moore (2000; [4] van Broekhuizen et al. 2005; [5] UV photolysis of H₂O:NH₃:CH₃OH:CO:CO₂ ice (Munoz Caro & Shutte 2003); [6] electron bombardment of CH₃NH₂:CO₂ ice (Holtom et al. 2005); [7] UV photolysis of ammonia-containing ices (Demyk et al. 1998); [8] UV photolysis of N₂:CH₄ ices at various pressures (Imanaka et al. 2004); [9] proton bombardment of H₂O:NH₃:CO ice (Hudson & Moore 2001).