Contact interaction between 129Xe and nitric oxide

Abstract

The chemical shift of 129Xe in nitric oxide gas has been observed as a function of temperature and density of NO. The derivative of the frequency with respect to density gives the second virial coefficient of chemical shielding of 129Xe in nitric oxide, σ1(Xe–NO) = −0.6840 + 1.5516 × 10−3τ − 1.3142 × 10−5τ2 +7.2769 × 10−8τ3 ppm amagat−1, in which τ=T−300, and T goes from 220 to 380 K. The results are compared with the Xe in oxygen gas and the contact contribution to σ1(Xe–NO) is determined. By using Ar as the diamagnetic counterpart of an NO or O2 molecule, empirical values of the integral ℱρspine−V/kTdx3 are obtained for the Xe–NO and the Xe–O2 interaction. The empirical values of this integral are greater for the Xe–NO pair than the Xe–O2 pair. Both exhibit a slight temperature dependence.