Infrared optical constants and band strengths of interstellar ice analogues: H2O:CO2 and H2O:CO2:CO mixtures at 10 K

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Table 6

Effective band strengths of the H₂O:CO₂:CO mixtures.

	Mode	Peak (cm⁻¹)	Int. range (cm⁻¹)	A’ (10⁻¹⁷ cm/molec)
				100:17	100:26	100:33	100:42	100:54
				:20	:22	:20	:20	:22
H₂O	ν₁, ν₃ Stretch	3292	2900-3800	17.3	16.7	15.9	16.8	15.7
H₂O	ν₂ bend	1650	1100-1850	1.08	1.02	1.09	1.11	1.16
H₂O	ν_L	750	500-1060	2.51	2.53	2.33	2.34	2.09
	Libration
CO₂	ν₃ stretch	2345	2290-2600	8.64	8.59	8.78	9.75	9.60
¹³CO₂	ν₃ stretch	2282	2267-2290	6.88	7.58	7.32	7.81	8.47
CO₂	ν₂ bend	657	632-670	1.32	1.50	1.55	1.50	1.47
CO	stretch	2139	2125-2165	0.81	0.86	0.90	0.85	0.90

				100:17	100:25	100:37	100:45	100:54
				:40	:39	:42	:42	:42

H₂O	v₁, v₃ Stretch	3292	2900-3800	17.7	16.4	16.4	16.0	15.9
H₂O	ν₂ bend	1650	1100-1850	1.07	1.13	1.04	1.16	1.16
H₂O	ν_L	750	500-1060	2.61	2.41	2.35	2.26	2.10
	Libration
CO₂	ν₃ stretch	2345	2290-2600	8.06	8.62	8.74	8.77	9.51
¹³CO₂	ν₃ stretch	2282	2267-2290	7.54	7.22	7.77	8.47	8.16
CO₂	ν₂ bend	657	632-670	1.32	1.50	1.58	1.55	1.51
CO	Stretch	2139	2125-2165	0.94	0.89	0.94	1.02	0.99

Notes. The band strengths correspond to the main IR absorption bands of the H₂O:CO₂:CO mixtures investigated in this work. Estimated uncertainties are 7% in general, and about 15% for ν₂ H₂O.

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