Frequency stabilization of a microwave spectrometer

In certain applications of a microwave EPR spectrometer it is an advantage to have monochromatic RF power feeding the sample. This thesis gives a brief introduction to electron magnetic resonance and describes a frequency stabilization circuit for the Varian Model No. 4500 Spectrometer which avoids frequency modulation of the klystron by locking the klystron frequency to that of a reference cavity.