| Abstract: | It is shown that if the full significance of the algebra involved in the performance of time-dependent perturbation calculations is appreciated, it is possible to predict the existence of a range of effects. These include magnetic field-dependent effects which can also be Raman shifted at sum, difference and second harmonic frequencies. The advantages of using these effects in conducting media is pointed out as well as the possible application to surface studies. These effects are all advantageously inproved by using resonance effects and in double-rather than single-beam experiments. |
