Abstract
In-situ observations of formation and growth processes of C0_2 hydrate crystal were carried out in a liquid C0_2 and water system by using a Mach-Zehnder interferometer. Since the hydrate crystal is transparent, the interferometric method is useful to measure the growth process and physical properties of the hydrate crystal. The shift of interference fringes between C0_2 dissolved water and C0_2 hydrate crystal provided the difference of refractive indices of these phases.
