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Experimental observation of Doppler-free signals for weak transitions can begreatly facilitated by an estimate for their expected amplitudes. We derive ananalytical model which allows the Doppler-free amplitude to be estimated forsmall Doppler-free signals. Application of this model to formaldehyde allowsthe amplitude of experimentally observed Doppler-free signals to be reproducedto within the experimental error.

Doppler-Free Spectroscopy of Weak Transitions: An Analytical Model Applied to Formaldehyde