Infrared spectra of complex organic molecules in astronomically relevant ice mixtures - V. Methyl cyanide (acetonitrile)

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Volume 665 (September 2022)

A&A, 665 (2022) A89

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Table C.1

Integrated absorbance of CH₃CN features in different ice mixtures at different temperatures. The values are normalized with respect to the CN stretching integrated absorbance at 15 K in the mixture.

T (K)	CH₃ rock 1041.6 cm⁻¹ (9.600 µm)	CH₃ symm. def 1374.5 cm⁻¹ (7.275 µm)	CH₃ antisymm. def. 1410 cm⁻¹ (7.092 µm)	Comb. 1448.3 cm⁻¹ (6.904 µm)	CN str. 2252.2 cm⁻¹ (4.4401 µm)	CH₃ symm. str. 2940.9 cm⁻¹ (3.400 µm)
Pure CH₃CN
15	0.80	0.65	1.06	1.44	1.00	0.29
30	0.80	0.64	1.04	1.41	1.00	0.27
50	0.77	0.61	0.98	1.34	1.01	0.26
80	0.73	0.58	0.89	1.23	1.00	0.23
100	-	-	0.94	1.23	1.05	0.30
120	-	-	1.16	1.26	1.01	0.40
140	-	-	1.11	1.18	0.98	0.40
150	-	-	0.76	0.84	0.87	0.33
Ice mixture: CH₃CN:H₂O (1:10)
15	0.42	0.36	0.70	1.18	1.00	0.38
30	0.41	0.34	0.68	1.14	0.99	0.35
50	0.36	0.33	0.63	1.05	0.93	0.31
80	0.31	0.33	0.58	0.94	0.89	0.23
100	-	0.30	0.51	0.86	0.84	0.20
120	-	0.32	0.48	0.78	0.85	0.18
140	-	-	-	0.69	0.89	0.26
Ice mixture: CH₃CN:CO (1:10)
15	1.14	0.49	0.73	1.31	1.00	0.54
30	1.19	0.58	0.98	1.44	1.08	0.64
Ice mixture: CH₃CN:CO₂ (1:10)
15	0.64	0.48	0.58	0.83	1.00	0.23
30	0.70	0.47	0.60	0.86	1.00	0.19
50	0.66	0.49	0.59	0.85	1.01	-
80	-	0.25	0.38	-	0.58	-
100	-	-	-	-	0.57	-
Ice mixture: CH₃CN:CH₄ (1:10)
15	0.79	0.51	0.66	1.54	1.00	0.30
30	0.84	0.54	0.69	1.45	1.08	0.35
50	0.67	0.48	0.72	1.09	0.86	0.28
Ice mixture: CH₃CN:NH₃ (1:10)
15	0.50	0.30	0.60	0.95	1.00	0.49
30	0.84	0.53	0.59	1.60	1.83	0.70
50	0.83	0.52	0.59	1.54	1.82	0.68
80	0.82	0.50	0.56	1.41	1.74	0.60
100	-	0.53	0.65	1.34	1.65	0.56
120	-		0.54	1.16	1.17	0.46
Ice mixture: CH₃CN:H₂O:CO₂
15	0.57	0.32	0.62	0.84	1.00	0.33
30	0.56	0.31	0.62	0.82	0.99	0.31
50	0.56	0.31	0.60	0.79	0.96	0.29
80	0.52	0.30	0.55	0.69	0.88	0.26
100	0.50	0.26	0.48	0.62	0.72	0.22
120	0.48	0.25	0.44	0.55	0.68	0.20
140	-	-	0.40	0.47	0.63	0.22
Ice mixture: CH₃CN:H₂O:CH₄:NH₃
15	0.46	0.33	0.67	1.02	1.00	0.35
30	0.41	0.32	0.66	0.99	1.00	0.32
50	0.37	0.26	0.60	0.92	0.99	0.28
80	0.39	0.28	0.52	0.82	0.93	0.18
100	0.27	0.29	0.53	0.79	0.93	0.15
120	0.19	0.26	0.46	0.72	0.91	0.11

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