Distortions of Magnetic Resonances by Additional and Excessive Oscillatory Fields

In the presence of an extraneous oscillatory field, the frequency at which transition probabilities are maximized in magnetic resonance experiments is shifted. Experimental measurements of this shift are described. An extension of the theory underlying this effect is given and the results of an experiment verifying the theory are presented. A distortion of molecular beam resonances occurring under certain circumstances when oscillating fields of excessive magnitude are used is also described, and some experimental work on this effect is summarized.