Optical pumping and magnetic resonance

Principles of the magnetic resonance technique. By means of optical pumping techniques large population differences can be generated between the Zeeman levels JMj or IFMp of the ground or metastable states of a sample of free atoms. If these atoms are then subjected-to a radio 

This can be displayed directly on an oscilloscope connected to the photocell, as shown in Fig.17.9, or may be recorded point by point by using a micro-ammeter. 

Schematic diagram of the apparatus required for optical pumping magnetic resonance experiments. 

As in the case of magnetic resonance in excited states discussed in section 16.2.3, the signals here also show a power broadening as the amplitude of the radio frequency field is increased. 

These experiments have enabled the nuclear moments of 199 201 

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