Irradiation dose affects the composition of organic refractory materials in space - Results from laboratory analogues

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Volume 644 (December 2020)

A&A, 644 (2020) A115

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Table 2

Elemental abundance ratios in organic refractory residues produced after ion bombardment and warm-up of H₂O:CH₃OH:NH₃ mixtures analysed in both positive (p) and negative (n) ESI modes.

		Range 50–300 m/z
Sample	ESI mode		Unweighted average			Weighted average
		N/C	O/C	H/C	N/C	O/C	H/C

1:1:1	p	0.34	0.30	1.73	0.38	0.27	1.81
+29 eV/16 u	n	0.24	0.60	1.59	0.14	0.87	1.73
	Average	0.29	0.45	1.66	0.26	0.57	1.77

3:1:1	p	0.39	0.29	1.74	0.41	0.29	1.78
+67 eV/16 u	n	0.30	0.61	1.57	0.19	0.88	1.71
	Average	0.35	0.45	1.66	0.30	0.58	1.74

1:1:1	p	0.41	0.29	1.71	0.43	0.29	1.75
+98 eV/16 u	n	0.32	0.57	1.47	0.30	0.67	1.51
	Average	0.36	0.43	1.59	0.37	0.48	1.63

		Range 150–400 m/z
Sample	ESI mode		Unweighted average			Weighted average

		N/C	O/C	H/C	N/C	O/C	H/C

1:1:1	p	0.31	0.31	1.70	0.33	0.31	1.74
+29 eV/16 u	n	0.27	0.50	1.63	0.27	0.53	1.64
	Average	0.29	0.41	1.67	0.30	0.42	1.69

3:1:1	p	0.37	0.30	1.69	0.38	0.29	1.71
+67 eV/16 u	n	0.35	0.49	1.62	0.35	0.51	1.62
	Average	0.36	0.40	1.65	0.36	0.40	1.66

1:1:1	p	0.38	0.30	1.62	0.39	0.29	1.65
+98 eV/16 u	n	0.35	0.48	1.48	0.35	0.50	1.49
	Average	0.36	0.39	1.55	0.37	0.40	1.57

Notes. We estimatea relative standard deviation of 6% for N/C, 12% for O/C, and 3% for H/C.

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