Abstract
It is well known that gas hydrates are non-stoichiometric compounds which cause experimental difficulty in determining the intrinsic physical and chemical properties of gas hydrates. Therefore, microscopic observation and high-pressure light scattering spectroscopy for single crystalline gas hydrates become ideal methods to investigate the pressure-induced phase trans-formation and the cage occupancy of guest gas molecules in gas hydrate structures. In this article, we present the technique of growing single crystalline gas hydrates and the applications of microscopic observation and light scattering measurements to methane hydrate as an example.