The hunt for formamide in interstellar ices - A toolkit of laboratory infrared spectra in astronomically relevant ice mixtures and comparisons to ISO, Spitzer, and JWST observations

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Table B.1

Relative apparent band strengths of the three selected bands of pure formamide and formamide in various binary and tertiary mixtures at temperatures from 15–212 K.

Matrix	T (K)	Rel. Band Strength C = O stretch + NH₂ bend 1700.3 cm⁻¹ (5.881 µm)	Rel. Band Strength CH bend 1388.1 cm⁻¹ (7.204 µm)	Rel. Band Strength CN stretch 1700.3 cm⁻¹ (7.529 µm)
		Int. Range: 2050-1532 cm⁻¹	Int. Range: 1532-1364 cm⁻¹	Int. Range: 1364-1258 cm⁻¹

	15	1.00	1.00	1.00
	49	0.99	1.00	0.97
	99	0.96	0.99	0.93
Pure	149	0.95	0.97	0.91

		Int. Range: 2050-1570 cm⁻¹	Int. Range: 1570-1364 cm⁻¹	Int. Range: 1364-1258 cm⁻¹

	170	0.70	1.01	1.015
	191	0.70	1.01	1.014
	212	0.60	0.82	0.857

		Int. Range: 1961-1553 cm⁻¹	Int. Range: 1532-1368 cm⁻¹	Int. Range: 1368-1258 cm⁻¹

	15	1.64	1.63	1.08
	49	1.66	1.67	1.13
H₂O	99	1.71	1.61	1.16
	129	1.63	1.57	1.18
	149	1.73	2.22	2.01
	161	1.32	2.10	2.00

		Int. Range: 1961-1532 cm⁻¹	Int. Range: 1532-1364 cm⁻¹	Int. Range: 1364-1240 cm⁻¹

	15	1.33	0.85	1.94
	34	1.34	0.84	1.88
CO₂	40	1.31	0.78	1.85
	49	1.31	0.79	1.88
	60	1.33	0.83	1.92
	90	1.36	0.93	1.91

		Int. Range: 1900-1500 cm⁻¹	Int. Range: 1532-1364 cm⁻¹	Int. Range: 1364-1240 cm⁻¹

CO	15	1.81	1.30	2.62
	31	1.81	1.34	2.71
	34	1.80	1.38	2.72

		Int. Range: 1800-1550 cm⁻¹	–	–

	15	1.42	–	–
	50	1.41	–	–
CH₃OH	100	1.39	–	–
	121	1.75	–	–
	139	1.70	–	–
	154	0.79	–	–

		–	Int. Range: 1484-1374 cm⁻¹	Int. Range: 1374-1258 cm⁻¹

	15	–	1.28	1.14
	51	–	1.28	1.11
NH₃	60	–	1.28	1.10
	90	–	1.24	1.05
	99	–	1.39	1.13
	108	–	1.41	1.15

		Int. Range: 1961-1553 cm⁻¹	Int. Range: 1437-1368 cm⁻¹	Int. Range: 1368-1279 cm⁻¹

	15	2.20	1.30	0.75
	51	2.18	1.23	0.67
H₂O:CO₂	101	1.89	1.10	0.51
	131	1.85	0.99	0.50
	149	1.88	1.55	1.24
	161	1.57	1.42	1.33

		–	Int. Range: 1437-1368 cm⁻¹	Int. Range: 1368-1279 cm⁻¹

	15	–	1.35	1.19
	51	–	1.36	1.21
H₂O:NH₃	99	–	1.32	1.27
	134	–	1.19	1.27
	149	–	1.11	1.24
	161	–	1.01	1.22

		Int. Range: 1810-1524 cm⁻¹	–	–

	15	1.57	–	–
CO:CH₃OH	30	1.64	–	–
	35	1.68	–	–

		–	Int. Range: 1460-1370 cm⁻¹	Int. Range: 1370-1256 cm⁻¹

	15	–	1.41	2.23
CO:NH₃	30	–	1.49	2.14
	37	–	1.54	1.85

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