Abstract
In-situ observations of formation and dissociation processes of CO_2 hydrates were carried out in a liquid CO_2 and water system by using a Mach-Zehnder interferometer. Since the hydrate crystal is transparent, the interferometric method is useful to measure the change of Physical properties of both the hydrate crystal and the environment during the formation and growth Processes. The shift of the fringe provided that the formation heat increased the temperature of liquid CO_2, and the refraction index of CO_2 hydrates were 0.03% greater than that of water.
