Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.22 nm.s-1 - Thickness = 271 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.22 nm.s-1 - Thickness = 383 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.22 nm.s-1 - Thickness = 495 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.22 nm.s-1 - Thickness = 608 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.22 nm.s-1 - Thickness = 720 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.22 nm.s-1 - Thickness = 832 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.22 nm.s-1 - Thickness = 942 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.22 nm.s-1 - Thickness = 1053 nm

Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.17 nm.s-1 - Thickness = 531 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.17 nm.s-1 - Thickness = 1070 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.17 nm.s-1 - Thickness = 1613 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.17 nm.s-1 - Thickness = 2142 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.17 nm.s-1 - Thickness = 2664 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.17 nm.s-1 - Thickness = 3182 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.17 nm.s-1 - Thickness = 3692 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 0.17 nm.s-1 - Thickness = 4190 nm

Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 1.28 nm.s-1 - Thickness = 565 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 1.28 nm.s-1 - Thickness = 1250 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 1.05nm.s-1 - Thickness = 1928 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 1.28 nm.s-1 - Thickness = 2589 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 1.28 nm.s-1 - Thickness = 3228 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 1.28 nm.s-1 - Thickness = 3846 nm Spectrum MIR absorbance spectrum of CH4 ice formed at 25 K with a deposition rate of 1.28 nm.s-1 - Thickness = 4465 nm