Variation of chemical shielding with intermolecular interactions and rovibrational motion. III. 31P nucleus in PH3

Abstract
The functions σ1(T) and σ0(T) have been determined for the 31P nucleus in PH3. The former is a measure of the intermolecular effects on chemical shielding whereas the latter is a property of the isolated molecule and is due to centrifugal distortion and anharmonic vibration. The PH3 molecule is of special interest since it is a good test case for the contributions to σ0(T) from the thermal average of bond angle deformation. It is also of interest that the observed temperature dependence of σ0 is in a direction opposite to that observed for other isolated molecules.