Nuclear Spin Relaxation in Gases and Liquids. IV. Interpretation of Experiments in Gases

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Abstract
The theory of nuclear spin relaxation in gases and liquids developed by Bloom and Oppenheim is used to interpret measurements of spin lattice relaxation times for various gaseous systems over wide ranges of temperature and density. The systems discussed include: molecular H2 with different ortho and para concentrations; mixtures of H2 with He, Ne, Ar, N2, CO2, O2, CO, NO, and N2O; and normal D2. The analysis leads to a determination of the form of the anisotropic intermolecular potentials providing that the form of the isotropic part of the intermolecular potentials are known. Values of quadrupole moments for H2, O2, N2, CO, NO, N2O, CO2, and D2 are obtained which are in good agreement with previous values. Thus, nuclear spin relaxation becomes a valuable tool for obtaining anisotropic intermolecular potentials.