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 5

Effective band strengths of the H₂O:CO₂ mixtures.

	Mode	Peak (cm⁻¹)	Int. range (cm⁻¹)	A’ (10⁻¹⁷ cm/molec)
				100:10	100:19	100:31	100:39	100:43	100:58
H₂O	ν₁, ν₃ Stretch	3292	2900-3900	19.5	18.3	17.4	16.6	16.4	17.0
H₂O	ν₂ bend	1650	1100-1850	1.07	1.16	1.20	1.14	1.22	1.27
H₂O	ν_L Libration	750	500-1060	2.46	2.46	2.47	2.31	2.37	2.14
CO₂	ν₃ stretch	2345	2290-2550	8.21	8.19	8.48	8.86	8.49	9.29
¹³CO₂	ν₃ stretch	2282	2267-2290	6.90	7.03	6.92	7.51	7.16	8.09
CO₂	ν₂ bend	657	632-670	1.264	1.413	1.511	1.585	1.451	1.493

Notes. The band strengths correspond to the main IR absorption bands of the H₂O:CO₂ mixtures investigated in this work. Peak positions corresponding to the bands of the pure species are indicated. Estimated uncertainties are 7% in general, and about 10%for ν₂ H₂O.

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