Dielectric and pressure virial coefficients of imperfect gases. Pure N2O

Dielectric and pressure virial coefficients of N2O have been measured at 6.5, 30.1, and 75.1 °C. The dipole moment and the polarizability determined from the first virial coefficient are, respectively, 0.18 D and 3.03 × 10−24cm3. In calculating the molecular quadrupole moment from the dielectric second virial coefficient, effects due to various interaction energy terms were taken into consideration. These energy terms are due to quadrupole-quadrupole interaction, dipole-dipole interaction, quadrupole-induced dipole interaction, reaction fields of induced moments, and anisotropic effects. Our experimental measurements lead to a molecular quadrupolar moment of 3.4 × 10−26 esu · cm2.