Figure 5
From: Diamond formation from methane hydrate under the internal conditions of giant icy planets
Typical Raman spectra of the sample before and after heating at approximately 1240 K and 37 GPa for 120 min. (a) Change in the C–H vibration modes via the decomposition of methane hydrate (MH-III; green circles) into solid methane (phase B; purple triangles) and ice VII. At this pressure, the O–H vibration mode of ice VII shifted out of the measured region15,16. (b) The H–H vibration modes of hydrogen-related materials produced through the reaction between the released hydrogen via the molecular dissociation of methane and undissociated methane or water, which are abundant in the sample chamber.
