The use of transient field techniques to measure nuclear g-factors and quadrupole moments is a well-established tool in nuclear structure studies: the properties of many short-lived states in stable nuclei have been measured by Coulomb excitation, while longer-lived isomeric states in stable nuclei are studied following heavy-ion reactions. However, the advent of radioactive beam facilities means that the Coulomb excitation technique must be extended to deal with ions moving at velocities that extend well beyond the K-electron velocity, Zv0. We are currently performing a series of measurements to characterise the transient magnetic field for light ions moving at high velocities, the results of which will be essential to planned g-factor measurements of projectile-fragmentation products such as the neutron-rich S isotopes. We are also developing a simple method of measuring sub-ns lifetimes which can be applied in-beam, thus providing precise lifetime information required by other moment measurements.