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Continuum resonance Raman spectra of ' * ' I 2 were numerically simulated using timedependent quantum theory. The calculated spectra were compared with results obtained from traditional time-indepeadent calculations, based on the Kramers-HeisenbereDmc relationship, and experimental data obtained earlier by Strempel and Kiefer. A symmetry principle for corresponding Stokes and antiStokes Raman spectra is also'demonstrated and the corm sponding spectra for this principle were simulated applying both timedependent and timeindependent theory. Further aspects such as the reflection principle and scattering delay times are discussed and compared with results obtained for 79Br2.

A simple trap current regulated ion source power supply for an isotope ratio mass spectrometer has been built, consisting mainly of commercially available voltage power supplies. Short term stability of 0.01% has been obtained with this system.

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