Infrared spectra of complex organic molecules in astronomically relevant ice matrices - III. Methyl formate and its tentative solid-state detection

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Volume 651 (July 2021)

A&A, 651 (2021) A95

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Table A.1

Integrated absorbance ratios of methyl formate for each of the selected transitions and temperatures, for both pure and mixed with astronomically relevant matrices, with respect to the C−O stretching mode (1211.3 cm⁻¹/8.256 μm).

Mixture	Temperature	OCO deform.	O−CH₃ stretch.	CH₃ rock.	C−O stretch.	C=O stretch.
	(K)	(13.02 μm)	(10.98 μm)	(8.582 μm)	(8.256 μm)	(5.804 μm)
HCOOCH₃	15	0.038	0.150	0.602	1.000	1.659
HCOOCH₃ : CO		0.032	0.141	0.567	1.000	1.458
HCOOCH₃ : H₂CO		0.038	0.178	0.983	1.000	−^(**)
HCOOCH₃ : CH₃OH		0.030	0.123	0.693	1.000	1.934
HCOOCH₃ : H₂O		0.023	0.075	0.226	1.000	2.291
HCOOCH₃ : Apolar		0.046	−^(*)	0.723	1.000	−^(**)

HCOOCH₃	30	0.038	0.150	0.598	1.000	1.669
HCOOCH₃ : CO		0.035	0.140	0.566	1.000	1.451
HCOOCH₃ : H₂CO		0.038	0.180	0.983	1.000	−^(**)
HCOOCH₃ : CH₃OH		0.029	0.131	0.714	1.000	1.972
HCOOCH₃ : H₂O		0.022	0.076	0.224	1.000	2.253
HCOOCH₃ : Apolar		0.043	−^(*)	0.727	1.000	−^(**)

HCOOCH₃	50	0.038	0.151	0.592	1.000	1.683
HCOOCH₃ : CO		0.029	0.142	0.467	1.000	1.396
HCOOCH₃ : H₂CO		0.037	0.183	0.979	1.000	−^(**)
HCOOCH₃ : CH₃OH		0.027	0.143	0.759	1.000	2.055
HCOOCH₃ : H₂O		0.023	0.069	0.221	1.000	2.181
HCOOCH₃ : Apolar		0.039	−^(*)	0.759	1.000	−^(**)

HCOOCH₃	80	0.039	0.154	0.595	1.000	1.718
HCOOCH₃ : CO		0.028	0.143	0.461	1.000	1.416
HCOOCH₃ : H₂CO		0.037	0.189	0.965	1.000	−^(**)
HCOOCH₃ : CH₃OH		0.029	0.153	0.796	1.000	2.145
HCOOCH₃ : H₂O		0.022	0.066	0.239	1.000	2.075
HCOOCH₃ : Apolar		0.035	−^(*)	0.769	1.000	−^(**)

HCOOCH₃	100	0.088	0.362	0.436	1.000	1.967
HCOOCH₃ : CO		0.032	0.156	0.569	1.000	1.591
HCOOCH₃ : H₂CO		0.036	0.237	0.718	1.000	−^(**)
HCOOCH₃ : CH₃OH		0.026	0.156	0.797	1.000	2.188
HCOOCH₃ : H₂O		0.021	0.062	0.268	1.000	2.035
HCOOCH₃ : Apolar		0.034	−^(*)	0.696	1.000	−^(**)

HCOOCH₃	120	0.089	0.366	0.439	1.000	1.992
HCOOCH₃ : CO		0.026	0.122	0.389	1.000	1.625
HCOOCH₃ : H₂CO		0.015	0.218	0.378	1.000	−^(**)
HCOOCH₃ : CH₃OH		0.111	0.496	1.597	1.000	4.295
HCOOCH₃ : H₂O		0.020	0.071	0.320	1.000	2.007
HCOOCH₃ : Apolar		0.026	−^(*)	0.578	1.000	−^(**)

Notes. ^(*) Cannot be determined due to H₂CO and CH₃OH matrix interaction, see Sect. 3.1. ^(**)Due to the overlapping C=O stretching modes of H₂CO and HCOOCH₃, the relative intensity cannot be determined, see Sect. 3.5.

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