Laboratory spectroscopy of theoretical ices: Predictions for JWST and test for astrochemical models

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Table 5

Optical depth and transmittance of the modelled ice features in L1544.

		τ		T

Molecule	Vibration mode	Layered	Mixed	Layered	Mixed
H₂O	ν₁, ν₃ OH stretch	3.81	3.82	0.022	0.022
	ν₂ OH bend	0.37	0.51	0.69	0.60
CH₃OH	OH & CH stretch	3.81	3.82	0.022	0.022
	ν₇, ν₁₁ CH₃ rock	0.32	0.30	0.73	0.74
	ν₈ CO stretch	2.16	1.70	0.12	0.18
N₂		0.022	0.026	0.98	0.97
O₂		0.018	–	0.98	–

Notes. The values have an error of 20–30% for strong bands (H₂O and CH₃OH) and 50% for week bands (N₂ and O₂).

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