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.
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