Negligible photodesorption of methanol ice and active photon-induced desorption of its irradiation products

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Volume 592 (August 2016)

A&A, 592 (2016) A68

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Table 3

Desorbed products during the irradiation of methanol ice.

	Irrad. Temp.	H₂		CH₄		CO
	[K]	[]	[]	[]	[]	[]	[]

CH₃OH
	8	-^∗	-^∗	6.1 ± 0.9 × 10¹⁵	0.002	2.1 ± 0.6 × 10¹⁶	0.008
	30	-^∗	-^∗	5.8 ± 1.1 × 10¹⁵	0.002	5.2 ± 0.5 × 10¹⁶	0.018
	50	-^∗	-^∗	4.1 ± 1.3 × 10¹⁶	0.014	1.5 ± 0.3 × 10¹⁷	0.056
	70	-^∗	-^∗	2.9 ± 1.0 × 10¹⁶	0.010	6.6 ± 0.6 × 10¹⁶	0.022
	90	-^∗	-^∗	1.4 ± 0.3 × 10¹⁶	0.005	3.1 ± 0.6 × 10¹⁶	0.011
	130	-^∗	-^∗	7.1 ± 0.4 × 10¹⁵	0.002	3.5 ± 0.4 × 10¹⁵	0.0012

	Irrad. Temp.	D₂		CD₄		CO
	[K]	[]	[]	[]	[]	[]	[]

CD₃OD
	8	2.1 ± 0.7 × 10¹⁸	0.7	4.5 ± 1.2 × 10¹⁵	0.002	2.4 ± 1.0 × 10¹⁶	0.009
	30	4.5 ± 0.4 × 10¹⁸	1.6	4.3 ± 1.3 × 10¹⁵	0.002	5.6 ± 0.5 × 10¹⁶	0.019
	50	6.0 ± 0.6 × 10¹⁸	2.1	2.6 ± 1.1 × 10¹⁶	0.009	9.5 ± 0.7 × 10¹⁶	0.033
	70	5.8 ± 0.3 × 10¹⁸	2.0	1.3 ± 0.4 × 10¹⁶	0.004	3.2 ± 0.9 × 10¹⁶	0.011
	90	5.1 ± 0.2 × 10¹⁸	1.8	9.9 ± 0.3 × 10¹⁵	0.003	9.2 ± 0.3 × 10¹⁵	0.003
	130	4.4 ± 0.3 × 10¹⁸	1.6	1.6 ± 0.4 × 10¹⁶	0.005	4.5 ± 1.0 × 10¹⁵	0.0016

Notes. Column [] denotes the total number of desorbed molecules per square centimeter for the total irradiation time, 240 min. Column [] denotes the average number of desorbed molecules per incident photon.

^(*)

These values suffer from background H₂ contamination in the chamber. Therefore, only the values for D₂ in the deuteraed-methanol irradiation experiment are reliable.

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