Theory of super-regenerative detection of N.Q.R.

Abstract

Signal intensities of the ³⁵Cl nuclear quadrupole transition in para-dichlorobenzene, obtained using a frequency modulated superregenerative spectrometer, are investigated as a function of quenching frequency. The quenching voltage is applied in the form of pulses of variable on (^ton) and off (^toff) times. A method is provided for the calculation of (V_s²/V_n²)½ which appears in the detection equation ΔA = aV⁰In(1 + V_s²/Vn²)^½ By applying the theory of nuclear induction to a series of pulses, such as those of a super-regenerative oscillator, it is possible to explain the observed behaviour of signal intensities with operational characteristics and solid state relaxation parameters.