DIELECTRIC STUDY OF PARTIALLY ISOTOPE-SUBSTITUTED SOLID AND LIQUID-HYDROGEN AND METHANE

The solid and liquid phases of hydrogen, n-H-2 and HD, and methane, CHD3 and CH3D, have been studied by dielectric measurements. It is found that increasing deuteration has only a minor effect on the molar polarization of hydrogen, but that it leads to a significant decrease of the polarizabilities of the liquid methanes. The dipole moments of the partially isotope substituted molecules have been determined in the solid state. For HD a local field corrected moment of 0.78 mD is found, for CHD3 and CH3D the moments are 4.3 and 4.1 mD, respectively.