Table 2: List of studied icy mixtures.
Number Sample Ratio Thickness Ion & energy Fluence Total dose Temperature

( $\mu$ m) (ions cm^-2) (eV/16 amu) (K)

1 CH₄ 3.7 He⁺, 30 keV 1.8 $\times$ 10¹⁵ 64 12

He⁺, 30 keV 1.8 $\times$ 10¹⁵ 130 100

Ar⁺⁺, 60 keV 1.1 $\times$ 10¹⁵ 1000 100

2 H₂O:CH₄:N₂ 1:6:3 5 He⁺, 30 keV 3.2 $\times$ 10¹⁶ 825 12

He⁺, 30 keV 2.0 $\times$ 10¹⁵ 300

3 CH₃OH:N₂ 1:2 10 He⁺, 30 keV 1.2 $\times$ 10¹⁶ 164 12

4 CH₃OH:N₂ 1:2 10 Ar⁺⁺, 60 keV 1.8 $\times$ 10¹⁵ 654 12

Ar⁺, 30 keV 7.1 $\times$ 10¹⁶ 1900 12

**Table 2:** List of studied icy mixtures.
Number	Sample	Ratio	Thickness	Ion & energy	Fluence	Total dose	Temperature
			( $\mu$ m)		(ions cm^-2)	(eV/16 amu)	(K)
1	CH₄		3.7	He⁺, 30 keV	1.8 $\times$ 10¹⁵	64	12
				He⁺, 30 keV	1.8 $\times$ 10¹⁵	130	100
				Ar⁺⁺, 60 keV	1.1 $\times$ 10¹⁵	1000	100
2	H₂O:CH₄:N₂	1:6:3	5	He⁺, 30 keV	3.2 $\times$ 10¹⁶	825	12
				He⁺, 30 keV	2.0 $\times$ 10¹⁵		300
3	CH₃OH:N₂	1:2	10	He⁺, 30 keV	1.2 $\times$ 10¹⁶	164	12
4	CH₃OH:N₂	1:2	10	Ar⁺⁺, 60 keV	1.8 $\times$ 10¹⁵	654	12
				Ar⁺, 30 keV	7.1 $\times$ 10¹⁶	1900	12

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