Shape of Modulation-Broadened, Unsaturated, Lorentzian Magnetic Resonance Transitions: A Theoretical and Experimental Study of the Fourier Coefficient aoL

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Abstract
The effect of modulation broadening on the shape of the Fourier coefficient aoL describing an unsaturated, Lorentzian absorption line is examined theoretically and experimentally. An unusual feature, not previously observed, is the development of two equal maxima when the normalized modulation amplitude (1/β) exceeds (2)1/2. Expressions are derived for the position and amplitude of these maxima as a function of (1/β). Experimental evidence confirming these expressions is presented.