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Lattice dynamics simulation of several gas hydrates (helium, argon, and methane) with different occupancy rates has been performed using TIP3P potential model. Results show that the cou- pling between the guest and host is not simple as depicted by the conventional viewpoints. For clathrate hydrate enclosing small guest, the small cages are dominantly responsible for the thermodynamic stability of clathrate hydrates. And the spectrum of methane hydrate is studied compared with argon hydrate, then as a result, shrink effect from positive hydrogen shell is proposed.
Lattice dynamics simulation of several gas hydrates (helium, argon, and methane) with different occupancy rates has been performed using TIP3P potential model. Results show that the couling between the guest and host is not simple as depicted by the conventional viewpoints. For clathrate hydrate enclosing small guest, the small cages are dominantly responsible for the thermodynamic stability of clathrate hydrates. And the spectrum of methane hydrate is studied compared with argon hydrate, then as a result, shrink effect from positive hydrogen shell is proposed.